US20120010530A1 - Blood test apparatus having blood sensor - Google Patents
Blood test apparatus having blood sensor Download PDFInfo
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- US20120010530A1 US20120010530A1 US13/237,157 US201113237157A US2012010530A1 US 20120010530 A1 US20120010530 A1 US 20120010530A1 US 201113237157 A US201113237157 A US 201113237157A US 2012010530 A1 US2012010530 A1 US 2012010530A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/157—Devices characterised by integrated means for measuring characteristics of blood
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/14532—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring glucose, e.g. by tissue impedance measurement
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/150022—Source of blood for capillary blood or interstitial fluid
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150053—Details for enhanced collection of blood or interstitial fluid at the sample site, e.g. by applying compression, heat, vibration, ultrasound, suction or vacuum to tissue; for reduction of pain or discomfort; Skin piercing elements, e.g. blades, needles, lancets or canulas, with adjustable piercing speed
- A61B5/150061—Means for enhancing collection
- A61B5/150099—Means for enhancing collection by negative pressure, other than vacuum extraction into a syringe by pulling on the piston rod or into pre-evacuated tubes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150175—Adjustment of penetration depth
- A61B5/15019—Depth adjustment mechanism using movable stops located inside the piercing device housing and limiting the travel of the drive mechanism
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
- A61B5/150213—Venting means
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150358—Strips for collecting blood, e.g. absorbent
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- A—HUMAN NECESSITIES
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
- A61B5/150381—Design of piercing elements
- A61B5/150412—Pointed piercing elements, e.g. needles, lancets for piercing the skin
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- A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
- A61B5/150381—Design of piercing elements
- A61B5/150503—Single-ended needles
- A61B5/150519—Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
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- A61B5/150007—Details
- A61B5/150847—Communication to or from blood sampling device
- A61B5/15087—Communication to or from blood sampling device short range, e.g. between console and disposable
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- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15115—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids
- A61B5/15117—Driving means for propelling the piercing element to pierce the skin, e.g. comprising mechanisms based on shape memory alloys, magnetism, solenoids, piezoelectric effect, biased elements, resilient elements, vacuum or compressed fluids comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
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- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15126—Means for controlling the lancing movement, e.g. 2D- or 3D-shaped elements, tooth-shaped elements or sliding guides
- A61B5/1513—Means for controlling the lancing movement, e.g. 2D- or 3D-shaped elements, tooth-shaped elements or sliding guides comprising linear sliding guides
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- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15186—Devices loaded with a single lancet, i.e. a single lancet with or without a casing is loaded into a reusable drive device and then discarded after use; drive devices reloadable for multiple use
- A61B5/15188—Constructional features of reusable driving devices
- A61B5/1519—Constructional features of reusable driving devices comprising driving means, e.g. a spring, for propelling the piercing unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0295—Strip shaped analyte sensors for apparatus classified in A61B5/145 or A61B5/157
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/14535—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring haematocrit
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1486—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using enzyme electrodes, e.g. with immobilised oxidase
Definitions
- the present invention relates to a blood sensor and a blood test apparatus with the blood sensor.
- Diabetes patients need to measure the blood sugar level (glucose level) regularly, and inject insulin based on the blood sugar level to maintain a normal blood sugar level.
- diabetes patients need to measure the blood sugar level frequently, sample a small amount of blood from fingertips of the patients using a blood test apparatus, and measure the blood sugar level using this sampled blood and a blood sensor for examining blood.
- FIG. 35 is a cross-sectional view showing an example of a conventional blood sensor (see Patent Document 1, for example).
- Blood sensor 1 shown in FIG. 35 is configured with: substrate 3 ; spacer 4 provided on the upper surface of substrate 3 ; and cover 5 provided on the upper surface of spacer 4 .
- Blood storing part 6 is provided so as to penetrate substrate 3 and spacer 4 and blood storing part 6 opens toward the side that abuts on the skin (downward in the figure).
- One end of blood supply channel 8 is connected to storing part 6 and the other end is connected to air hole 9 .
- Blood detecting section 2 is formed in blood supply channel 8 , and reagent 10 is placed on detecting section 2 .
- FIG. 36A is a perspective plan view of blood sensor 1 seen from above (from the cover 5 side).
- working electrode 14 b and counter electrode 14 c function as detection electrodes and form detecting section 2 .
- the blood sensor shown in FIG. 36B is also known (see Patent Document 2).
- working electrode 14 b and counter electrode 14 c function as detection electrodes and form detecting section 2 .
- FIG. 37 shows a state where needle 11 is pulled up and stays in its original position after blood sampling is finished.
- sensor 1 is brought into contact with skin 7 of the patient.
- puncturing needle 11 is propelled in the direction of arrow 12 .
- Puncturing needle 11 breaks through cover 5 forming upper side 6 a of storing part 6 , forms puncturing hole 14 in upper side 6 a , and, further, penetrates puncturing hole 14 and scars skin 7 .
- Blood 13 flows out from skin 7 where a scar is made. The outflowing blood 13 fills storing part 6 .
- Blood 13 that fills storing part 6 is led to detecting section 2 through supply channel 8 by capillary action.
- blood 13 between working electrode 14 b and counter electrode 14 c reacts with reagent 10 and produces a current proportional to the blood sugar level.
- the current produced is led to a measuring circuit in the blood test apparatus via a connector that contacts with connection terminal 15 b and a connector that contacts with connection terminal 15 c .
- the measuring circuit measures the current proportional to the blood sugar level and calculates the blood sugar level.
- the calculated blood sugar level provides basic data and the like showing the amount of insulin to administer to the patient.
- the conventional blood sensor When attached to a blood test apparatus, the conventional blood sensor needs to be adjusted its angle of attachment to contact with the connectors of the blood test apparatus at desired positions.
- a detecting electrode and an Hct electrode (described later) are also going into use as electrode system of a blood sensor. Therefore, to connect the connectors to the connection terminals of the electrode system adequately, it is necessary to adjust their angle of attachment more precisely. For example, if an approximate round blood sensor is attached to a blood test apparatus casually, it is not clear whether connection terminal contacts with the connector, or it is not possible to specify with which of the connectors each connection terminal contacts, and so blood sugar level measurement is not possible.
- the blood sensor may be attached by adjusting the angle of the blood sensor and adjusting the attachment position to a desired position with eyes, using a mark and the like as a reference.
- this attaching work becomes a burden for the patient.
- this work becomes a great burden for diabetes patients with poor eyesight.
- the blood sensor of the present invention is characterized in that the blood sensor has a reference terminal which serves as a reference for identifying each of a plurality of connection terminals.
- the blood sensor of the present invention has: a reference terminal whose electrical resistance with one of the plurality of connection terminals is adjusted to a predetermined value; or two or more reference terminals electrically connected with each other via a conductor.
- the blood sensor of the present invention has a reference terminal that serves as a reference for identifying each of a plurality of connection terminals, and specifies the individual connection terminals based on the reference terminal. Therefore, the connection terminals can be identified automatically, and the conventional adjustment of the attachment position with eyes is not necessary for attaching the blood sensor, so that the attaching work becomes extremely simple.
- FIG. 1A is a cross-sectional view of a blood sensor not having a hole in a cover for a puncturing needle to pass through;
- FIG. 1B is a cross-sectional view of a blood sensor with a hole in a cover for a puncturing needle to pass through;
- FIG. 2 is a cross-sectional view showing a state where blood is brought in the blood sensor
- FIG. 3A is a plan view of the cover
- FIG. 3B is a plan view of the spacer
- FIG. 3C is a plan view of the substrate
- FIG. 4 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal insulated from a connection terminal of a detecting electrode, having four pairs of connectors, and having an octagon shape;
- FIG. 5 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a detecting electrode via a conductor, having five connectors, and having an octagon shape;
- FIG. 6 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a counter electrode via a conductor, having five connectors, and having a quadrangle shape;
- FIG. 7 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a detecting electrode at a predetermined resistance value, having five connectors, and having an octagon shape;
- FIG. 8 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a counter electrode via a conductor and a dummy electrode, having six connectors, and having a hexagon shape;
- FIG. 9A is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a detecting electrode, a working electrode, a counter electrode and a reference terminal, but does not have an Hct electrode, having four connectors, and having a regular square shape;
- FIG. 9B is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a detecting electrode, a working electrode, a counter electrode and a reference terminal, but doe not have an Hct electrode, having four connectors, and having a rectangle shape;
- FIG. 10 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having two reference terminals and six connectors, and having a hexagon shape;
- FIG. 11A shows a blood sensor with an attaching guide
- FIG. 11B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 11A is attached;
- FIG. 11C shows a state where the blood sensor is attached to the attaching part which prevents the blood sensor from being attached at undesirable positions
- FIG. 11D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 12A shows a blood sensor with an attaching guide
- FIG. 12B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 12A is attached;
- FIG. 12C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 12D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 13A shows a blood sensor with an attaching guide
- FIG. 13B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 13A is attached;
- FIG. 13C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 13D shows a state where the blood sensor is attached to the attaching part which prevents the blood sensor from being attached at undesirable positions
- FIG. 14A shows a blood sensor with an attaching guide
- FIG. 14B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 14A is attached;
- FIG. 14C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 14D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 15A shows a blood sensor with an attaching guide
- FIG. 15B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 15A is attached;
- FIG. 15C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 15D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions;
- FIG. 16A shows a blood sensor with attaching guides
- FIG. 16B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 16A is attached;
- FIG. 16C shows a state where the blood sensor is attached to the attaching part and the attaching guides lead the blood sensor to a predetermined attachment position
- FIG. 17A shows a blood sensor with attaching guides
- FIG. 17B shows an attaching part of the blood test apparatus to which the blood sensor shown in FIG. 17A is attached, and in which connectors are arranged at unequiangular intervals;
- FIG. 17C shows a state where the blood sensor shown in FIG. 17A is attached to the attaching part shown in FIG. 17B ;
- FIG. 17D shows a state where the blood sensor shown in FIG. 17A is attached to the attaching part shown in FIG. 17B ;
- FIG. 17E shows a state where the blood sensor shown in FIG. 17A is attached to the attaching part shown in FIG. 17B ;
- FIG. 17F shows a state where the blood sensor shown in FIG. 17A is attached to the attaching part shown in FIG. 17B ;
- FIG. 17G shows a state where the blood sensor shown in FIG. 17A is attached to the attaching part shown in FIG. 17B ;
- FIG. 17H shows a state where the blood sensor shown in FIG. 17A is attached to the attaching part shown in FIG. 17B ;
- FIG. 18A is a diagrammatic perspective view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached;
- FIG. 18B is a cross-sectional view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached;
- FIG. 18C is a cross-sectional view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached;
- FIG. 18D is a cross-sectional view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached;
- FIG. 19A is a diagrammatic perspective view of a blood sampling cartridge including a blood sensor and a holder, and a blood test apparatus to which the blood sampling cartridge is attached, the blood sampling cartridge having electrodes that connects with the electrodes of the blood sensor through wiring;
- FIG. 19B is a diagrammatic perspective view of a blood sampling cartridge including a blood sensor and a holder, and a blood test apparatus to which the blood sampling cartridge is attached, the blood sampling cartridge having electrodes that connect with the electrodes of the blood sensor through wiring;
- FIG. 19C is a cross-sectional view of a blood sampling cartridge with electrodes that connect with the electrodes of the blood sensor through wiring, and an attaching part of the blood test apparatus;
- FIG. 19D is a cross-sectional view showing a state where the blood sampling cartridge with electrodes that connect with the electrodes of the blood sensor through wiring, is attached to the attaching part;
- FIG. 19E is a cross-sectional view showing a state where the blood sampling cartridge with electrodes that connect with the electrodes of the blood sensor through wiring, is attached to the attaching part;
- FIG. 20 is a diagrammatic perspective view of the blood sampling cartridge
- FIG. 21 is a diagrammatic perspective view showing assembly of the blood sampling cartridge
- FIG. 22A is a cross-sectional view of the blood sampling cartridge upon puncturing
- FIG. 22B is a cross-sectional view of the blood sampling cartridge after puncturing is finished
- FIG. 23 is a plan view that expands the main part of an attaching guide for inserting the blood sampling cartridge into an attaching part;
- FIG. 24 is a cross-sectional view of the attaching part of the blood test apparatus into which the blood sampling cartridge is inserted;
- FIG. 25A is a cross-sectional view showing a state of a lancet before puncturing in a state where the blood sampling cartridge is attached to the blood test apparatus;
- FIG. 25B is a cross-sectional view showing a state of the lancet upon puncturing in a state where the blood sampling cartridge is attached to the blood test apparatus;
- FIG. 25C is a cross-sectional view showing a state of the lancet after puncturing is finished in a state where the blood sampling cartridge is attached to the blood test apparatus;
- FIG. 26 is a cross-sectional view of the blood test apparatus to which the blood sampling cartridge is attached;
- FIG. 27 shows a flow of blood sugar level (glucose) measurement using the blood test apparatus
- FIG. 28 shows a principle of glucose measurement in blood using the blood test apparatus
- FIG. 29 is a characteristic diagram of blood sugar level (glucose) measurement
- FIG. 30 is a block diagram of the blood test apparatus
- FIG. 31 is a block diagram of the blood test apparatus with a negative pressure apparatus
- FIG. 32 is a cross-sectional view of the blood test apparatus with a negative pressure apparatus
- FIG. 33 is a cross-sectional view that expands the main part of the blood test apparatus with a negative pressure apparatus
- FIG. 34 shows a state of use of the blood test apparatus
- FIG. 35 is a cross-sectional view of a conventional blood sensor
- FIG. 36A and FIG. 36B are perspective plan views of a conventional blood sensor.
- FIG. 37 illustrates the way to use a conventional blood sensor.
- the blood sensor of the present invention is a component that is attached to a blood test apparatus and that can be removed or changed.
- the blood test apparatus has a plurality of connectors that connect with the blood sensor which is attached at a predetermined position.
- FIG. 1A and FIG. 1B are cross-sectional views of blood sensor 20 which is an example of the blood sensor.
- Blood sensor 20 is formed with base plate 35 .
- Base plate 35 has substrate 21 , spacer 22 pasted on the upper surface of substrate 21 , and cover 23 pasted on the upper surface of spacer 22 .
- Blood storing part 24 is provided in base plate 35 of blood sensor 20 - 1 shown in FIG. 1A and opens toward the side that will be placed on the skin (downward in the figure). Storing part 24 is formed with hole 21 a provided in substrate 21 and hole 22 a provided in spacer 22 . Blood storing part 24 is preferably provided in approximately the center of base plate 35 .
- supply channel 25 is connected to storing part 24 .
- the blood stored in storing part 24 flows into supply channel 25 by capillary action and is led to detecting section 27 .
- the other end of supply channel 25 is connected to air hole 26 .
- Reagent 10 is preferably placed on detecting section 27 .
- Detecting section 27 which will be described later, is, for example, placed on substrate 21 .
- Reagent 10 is selected as appropriate depending on the type of the blood component to be measured.
- reagent 10 is prepared by dropping on detecting section 27 a reagent solution prepared by adding and dissolving PQQ-GDH (0.1 to 5.0 U/sensor), potassium ferricyanide (10 to 200 mM), maltitol (1 to 50 mM) and taurine (20 to 200 mM) to a 0.01 to 2.0 wt % aqueous solution of CMC, and drying the reagent solution.
- hole 23 a may be provided in cover 23 . Puncturing needle 32 (described later) passes through hole 23 a . If hole 23 a is provided in cover 23 in advance, it is not necessary to open a puncturing hole in cover 23 using puncturing needle 32 , so that less force is required upon puncturing, and the damage of the needle tip of puncturing needle 32 is minimized.
- FIG. 2 shows a state where blood is brought in blood sensor 20 .
- blood sensor 20 is brought into contact with skin 7 of the patient (such as finger skin).
- a puncturing means provided in the blood test apparatus makes a scar on skin 7 .
- the puncturing means is puncturing needle 32 in FIG. 2 , but the puncturing means is not particularly limited to this and may be a laser, for example.
- Puncturing needle 32 provided in the blood test apparatus is propelled in the direction of the arrow. Puncturing needle 32 breaks through cover 23 forming upper side 24 a of storing part 24 (when there is no hole 23 a in cover 23 ) and forms puncturing hole 36 .
- Puncturing needle 32 makes a scar on skin 7 .
- Blood 13 flows out from skin 7 where a scar is made. The outflowing blood 13 fills storing part 24 . Blood 13 then flows into supply channel 27 by capillary action and is led to detecting section 27 .
- Diameter 26 a of air hole 26 is preferably 50 to 500 ⁇ m (for example, 50 ⁇ m) to prevent blood from flowing out more than necessary from air hole 26 .
- the area of air hole 26 in blood sensor 20 - 1 is preferably smaller than the area of puncturing hole 36 (hole in cover 23 , formed by puncturing needle 32 ; see FIG. 2 ).
- the area of puncturing hole 36 is larger than air hole 26 .
- most of blood 13 over-sampled in storing part 24 flows out from puncturing hole 36 .
- less blood 13 flows out from air hole 26 , and so reagent 10 is less likely to be washed away.
- the area of hole 23 a provided in cover 23 in blood sensor 20 - 2 is preferably larger than that of air hole 26 .
- the area of the reverse side of cover 23 (the surface pasted to the spacer) corresponding to “the inner surface of supply channel 25 ” is preferably subjected to hydrophilicity treatment to make blood 13 smoothly flow into supply channel 25 by capillary action. Further, the area of the reverse side of cover 23 corresponding to “the upper side of storing part 24 ” is preferably less hydrophilic than the area of the reverse side of cover 23 corresponding to the inner surface of supply channel 25 to make blood 13 more smoothly flow into supply channel 25 at a constant speed. If blood 13 flows into supply channel 25 at a constant speed and reaches detecting section 27 , the melting behavior of reagent 10 exhibits no variation, and the components of blood 13 can be measured correctly.
- the surface of cover 23 (the reverse side of the surface pasted to the spacer) is preferably subjected to water-repellency treatment to prevent the blood in storing part 24 from flowing out more than necessary from air hole 26 or a hole in cover 23 (for example, puncturing hole 36 by puncturing needle 32 or hole 23 a in the cover).
- the area of the reverse side of cover 23 corresponding to “the upper side of storing part 24 ” is preferably less water-repellent than the surface of cover 23 to prevent the blood in storing part 24 from flowing out, more effectively.
- At least the periphery of hole 21 a is preferably water-repellent, and the whole surface may be water-repellent.
- water-repellency preferably refers to a state where the surface free energy is less than 43 mN/m.
- the level of the hydrophilicity or water-repellency is adjusted by performing hydrophilicity treatment or water-repellency treatment.
- hydrophilic material or water-repellent material may be mixed with the material of a member forming blood sensor 20 or hydrophilic material or water-repellent material may be applied to the surface of the member.
- the level of hydrophilicity or water-repellency is also adjusted.
- hydrophilicity can be reduced.
- the characteristic of the hydrophilic material can be adjusted by radiating UV to the hydrophilic material.
- Blood sensor 20 with its hydrophilicity or water-repellency controlled as described above, is manufactured using, for example, the following method.
- water-repellent treatment is applied to the upper surface of cover 23
- hydrophilic treatment is applied to the lower surface of cover 23 .
- the whole of the reverse side of substrate 21 (reverse surface of the surface pasted to the spacer) or the periphery of hole 21 a may be subjected to hydrophobic treatment.
- substrate 21 , spacer 22 and cover 23 are pasted (spacer 22 is pasted on the surface of cover 23 , where hydrophilicity treatment is applied).
- blood sensor 20 has blood storing part 24 and blood supply channel 25 , and the volume of storing part 24 is one to twenty times, preferably four to fifteen times, and, more preferably, five to seven times as much as the volume of supply channel 25 .
- the volume of storing part 24 in blood sensor 20 - 1 shown in FIG. 1A may be 0.904 ⁇ L
- the volume of blood supply channel 25 may be 0.144 ⁇ L.
- the speed of the blood flowing in supply channel 25 can be controlled to be constant, and the flow rate of the blood flowing in supply channel 25 can be controlled adequately, so that blood does not wash away reagent 10 and reacts with reagent 10 sufficiently, which realizes a correct test.
- volume ratio between storing part 24 and supply channel 25 it is possible to reduce their volumes. Therefore, the amount of the blood sampled for a test can be reduced, and the load on the patient can be also alleviated.
- the thickness of substrate 21 , spacer 22 and cover 23 of blood sensor 20 and their ratio are important for sampling blood.
- the thickness of spacer 22 preferably falls within a range of 0.05 to 0.15 mm (preferably 0.1 mm).
- the thickness of cover 23 is preferably less than the thickness of substrate 21 so that the total thickness of blood sensor 20 is thinner. Therefore, the thickness of substrate 21 :the thickness of spacer 22 :the thickness of cover 23 may be 2.5:1.3:1 as a reference.
- FIG. 3 is a plan view of disassembled blood sensor 20 - 1 .
- blood sensor 20 - 1 has cover 23 shown in FIG. 3A , spacer 22 shown in FIG. 3B and substrate 21 shown in FIG. 3C .
- FIG. 3C is a plan view of substrate 21 .
- substrate 21 is an octagon, the shape of the substrate is not particularly limited.
- the material of substrate 21 is preferably resin such as polyethylene terephthalate (PET).
- PET polyethylene terephthalate
- the thickness of substrate 21 preferably falls within a range of 0.075 to 0.25 mm (preferably 0.188 mm).
- Electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a connected to electrodes 28 to 31 of the electrode system, respectively, are formed in an integrated manner. Electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a are formed by forming a conductive layer using the sputtering method or the vapor deposition method, using gold, platinum, palladium as material and applying laser machining to this conductive layer. Hole 21 a is provided in approximately the center of substrate 21 , and its diameter may be approximately 2.0 mm.
- FIG. 3B is a plan view of spacer 22 .
- the thickness of spacer 22 may fall in a range of 0.05 to 0.15 mm (preferably 0.1 mm).
- Spacer 22 is preferably a polygon such as an approximate cross shape, because connector 47 (not shown) of the blood test apparatus can be arranged in a cross-shaped dent easily.
- Hole 22 a is provided in approximately the center of spacer 22 , at the position matching hole 21 a provided in substrate 21 .
- the diameter of hole 22 a may be made the same (approximately 2.0 mm) as the diameter of hole 21 a .
- Slit 22 e is formed in one convex portion of the cross-shaped spacer 22 from hole 22 a .
- the slit 22 e matches blood supply channel 25 .
- the cavity of supply channel 25 may be set approximately 0.144 ⁇ L. In this way, test can be performed with a small amount of blood, so that the load on the patient becomes small, and the patient does not feel fear.
- the material of spacer 22 may be resin such as polyethylene terephthalate (PET).
- FIG. 3A is a plan view of cover 23 .
- Cover 23 has an approximate cross shape
- air hole 26 is provided in cross-shaped first convex portion 23 d so as to match the tip part of supply channel 25 .
- the diameter of air hole 26 is approximately 50 ⁇ m.
- cover 23 is plastic, and preferably polyethylene terephthalate.
- the thickness of cover 23 may fall in a range of 0.05 to 0.25 mm (preferably 0.075 mm).
- Blood sensor 20 an electrode system including a plurality of electrodes, connection terminals deriving from each electrode of the electrode system and a reference terminal are arranged.
- Blood sensor 20 has (1) a reference terminal connected with one of the connection terminals at a predetermined resistance value or (2) two or more reference terminals connected with each other at a predetermined resistance value (preferably 0).
- an electrode system arranged in the blood sensor includes at least a “working electrode” and a “counter electrode.”
- the “working electrode” refers to an electrode for measuring blood components
- the “counter electrode” refers to a counterpart electrode of the working electrode.
- the electrode system arranged in the blood sensor preferably includes a detecting electrode.
- the “detecting electrode” refers to an electrode for detecting whether blood is supplied to the detecting section.
- the electrode system may include an Hct electrode, which refers to an electrode for measuring the hematocrit level of blood.
- Blood sensor 20 is preferably a round or a polygon, but the shape is not particularly limited. If blood sensor 20 is a quadrangle or a hexagon, it is possible to improve the yield rate in manufacturing. Further, a hexagon allows a large inscribed circle and is therefore more preferable. That is, if the inscribed circle is the same, the area of the hexagon is smaller than the area of the quadrangle, because of that the hexagon is advantageous.
- FIG. 4 to FIG. 9 are perspective plan views of blood sensor 20 and show examples of the arrangement of electrodes in above-described blood sensor 20 (1) that has a reference terminal connected with one of the plurality of connection terminals at a predetermined resistance value.
- FIG. 10 is a perspective plan view showing an example of the arrangement of electrodes in above-described blood sensor 20 (2) that has two or more reference terminals connected with each other at a predetermined resistance value.
- Electrodes 28 to 31 of the electrode system are formed from storing part 24 toward air hole 26 . From storing part 24 , electrode 31 as an Hct electrode, electrode 30 as a counter electrode, electrode 28 as a working electrode, (electrode 30 as a counter electrode) and electrode 30 as a detecting electrode, are arranged in that order.
- Detecting section 27 is formed on substrate 21 , reagent 10 is placed in contact with part of detecting section 27 .
- Reagent 10 is preferably placed in contact with electrode 28 which functions as a working electrode, and electrode 30 which functions as a counter electrode.
- reagent 10 is preferably not placed in contact with electrode 31 which functions as an Hct electrode.
- connection terminals 28 a to 31 a each have contact part that contacts with a connector pair including two connectors. That is, connection terminal 28 a has a contact part formed with 28 c and 28 d , connection terminal 29 a has a contact part formed with 29 c and 29 d , connection terminal 30 a has a contact part formed with 30 c and 30 d , and connection terminal 31 a has a contact part formed with 31 c and 31 d .
- the contact parts are arranged along the outer periphery of substrate 21 .
- 29 c is electrically insulated from 29 d , (that is, connection terminals 29 a is electrically insulated from 29 c ), and the resistance between 29 c and 29 d becomes infinite, while the resistance between 28 c and 28 d , 30 c and 30 d , and 31 c and 31 d becomes zero.
- 29 c may be arranged on insulating member 34 provided on connection terminal 29 a , a slit may be provided around 29 c , or 29 c may be insulated from 29 d by cutting out part including contact part 29 c from connection terminal 29 a.
- connection terminal 29 c insulated from 29 d can be used as a reference terminal.
- connection terminal 29 a When the electrical resistance between the contact parts in pairs is measured, the resistance in one pair is infinite, so that it is possible to specify reference terminal 29 c .
- the connection terminals can be identified, for example, clockwise as connection terminal 29 a , connection terminal 30 a , connection terminal 31 a and connection terminal 28 a , and the functions of each electrode of electrode system connected to the connection terminals can be specified.
- blood sensor 20 a having a reference terminal is attached to an attaching part (described later) of the blood test apparatus, it is not necessary to consider the relationship between the connectors of the blood test apparatus and the contact parts of the blood sensor, and so it is not necessary to adjust the angle of attachment with eyes, so that attaching a blood sensor becomes simple.
- blood sensor 20 b shown in FIG. 5 is an octagon
- blood sensor 20 b may have other shapes.
- blood sensor 20 b has electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a deriving from each electrode of the electrode system.
- Connection terminals 28 a to 31 a have contact parts 28 g to 31 g , respectively, and, further, connection terminal 29 a has reference contact part 29 h in addition to contact part 29 g , and 29 h serves as a reference terminal.
- the reference contact part does not have to be provided in connection terminal 29 a , but may be provided in any one of connection terminals 28 a to 31 a .
- Contact parts 28 g to 31 g and reference contact part 29 h are preferably arranged near the outer periphery at equiangular intervals.
- a regular pentagon may be formed with parts 28 g , 29 g , 30 g , 31 g and 29 h .
- blood sensor 20 b may be made the same as blood sensor 20 a except that the mode of the reference contact part is different.
- Reference contact part 29 h can be specified by measuring the electrical resistance between reference contact part 29 h and each of contact parts 28 g to 31 g . That is, the electrical resistance between one of the contact parts of the connection terminals and reference contact part 29 h becomes zero, and so reference contact part 29 h can be specified.
- the connection terminals can be identified clockwise as connection terminals 29 a , 30 a , 31 a and 28 a , and the arrangement of the connection terminals can be specified.
- Blood sensor 20 b has contact parts 28 g to 31 g and reference contact part 29 h , and so the blood test apparatus (described later), to which blood sensor 20 b is attached, has five connectors matching the contact parts and the reference contact part. Further, the blood test apparatus has five terminals matching the connectors.
- blood sensor 20 b ′ shown in FIG. 6 is a quadrangle
- blood sensor 20 b ′ may have other shapes.
- blood sensor 20 b ′ has electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a deriving from each electrode of the electrode system.
- Connection terminals 28 a to 31 a have contact parts 28 g to 31 g , respectively, and, further, connection terminal 30 a corresponding counter electrode 30 has reference contact part 30 h in addition to contact part 30 g , and 30 h serves as a reference terminal.
- the connection terminals are specified in the same way as in blood sensor 20 b.
- blood sensor 20 c shown in FIG. 7 is an octagon
- blood sensor 20 c may have other shapes.
- blood sensor 20 c has electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a deriving from each electrode of the electrode system.
- Connection terminals 28 a to 31 a have contact parts 28 g to 31 g , respectively.
- connection terminal 29 a has reference contact part 29 h in addition to contact part 29 g , and 29 h serves as a reference terminal.
- Reference contact part 29 h and contact part 29 g are connected at a predetermined resistance value.
- a reference contact part does not have to be provided in connection terminal 29 a but may be provided in any one of connection terminals 28 a to 31 a .
- blood sensor 20 c may be made the same as blood sensor 20 a except that the mode of the reference contact part is different.
- Contact parts 28 g to 31 g and reference contact part 29 h are preferably arranged near the outer periphery at equiangular intervals.
- a regular pentagon may be formed with contact parts 28 g , 29 g , 30 g , 31 g and reference contact part 29 h . Therefore, in the same way as the case of blood sensor 20 b , the blood test apparatus to which blood sensor 20 c is attached, has five connectors and five terminals.
- connection part 29 g and reference contact part 29 h are connected with pattern (used as an example of predetermined resistance) 38 which is patterned by laser machining in connection terminal 29 a .
- pattern 38 By changing the width of pattern 38 , it is possible to adjust the resistance value between contact part 29 g and reference contact part 29 h to a predetermined value. Therefore, reference contact part 29 h can be specified by measuring the electrical resistance between reference contact part 29 h and each of contact parts 28 g to 31 g . That is, the electrical resistance between one of the contact parts of the connection terminals and reference contact part 29 h becomes a predetermined value, and so the reference contact part can be specified. Based on the specified reference contact part ( 29 h in this example), the connection terminals can be identified clockwise as connection terminals 29 a , 30 a , 31 a and 28 a , and the arrangement of the connection terminals can be specified.
- Reference contact part 29 h can be also used to determine the type of blood sensor 20 c other than used as a reference terminal. Examples of determining the type of the blood sensor include setting the blood test apparatus so that calibration curve 1 is used when the resistance value of pattern 38 is 200 to 1000 ohms, calibration curve 2 is used when the resistance value is 1000 to 2000 ohms, and calibration curve 3 is used when the resistance value is 2000 to 3000 ohms, determining the type of the blood sensor from the resistance value, and automatically selecting the calibration curve to be applied. Further, it is also possible to determine the product specifications of shipped blood sensors, for example, the specification for company A and the specification for company B, depending on the resistance values of pattern 38 . Further, by changing an oscillation frequency according to an inductance value adjusted by pattern 38 so that configuring blood sensor 20 c has various information, the blood sensor can be determined using the information.
- Blood sensor 20 d shown in FIG. 8 is a hexagon, blood sensor 20 d may have other shapes.
- Blood sensor 20 d has electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a deriving from each electrode of the electrode system.
- Connection terminals 28 a to 31 a have contact parts 28 g to 31 g , respectively.
- connection terminal 30 a has reference contact part 30 h used as a reference terminal in addition to contact part 30 g .
- the reference contact part does not have to be provided in connection terminal 30 a but may be provided in any one of connection terminals 28 a to 31 a.
- blood sensor 20 d also has dummy electrode 33 .
- the dummy electrode is provided to maintain mechanical balance (balance of the contact positions).
- Contact part 33 g is arranged on dummy electrode 33 . Therefore, the blood test apparatus to which blood sensor 20 d is attached, has six connectors.
- Contact parts 28 g to 31 g and reference contact part 30 h are preferably arranged near the outer periphery of blood sensor 20 d at equiangular intervals.
- a regular hexagon may be formed with parts 28 g to 31 g , 30 h and 33 g.
- the reference contact part 30 h can be specified by measuring the electrical resistance between reference contact part 30 h , and each of contact parts 28 g to 31 g and contact part 33 g of dummy electrode 33 . That is, the electrical resistance between one of the contact parts and reference contact part 30 h becomes zero, and so reference contact part 30 h can be specified.
- the connection terminals can be identified clockwise as connection terminal 30 a , dummy electrode 33 , connection terminal 31 a of an Hct electrode, connection terminal 28 a of a working electrode and connection terminal 29 a of a detecting electrode, and the arrangement of the connection terminals can be specified.
- blood sensor 20 e shown in FIG. 9A is a regular square and blood sensor 20 e ′ shown in FIG. 9B is a rectangle, blood sensor 20 e and blood sensor 20 e ′ may have other shapes.
- Blood sensors 20 e and 20 e ′ have electrode 28 for a working electrode, electrode 29 for a detecting electrode, and electrode 30 for a counter electrode, and are different from above-described blood sensors 20 a to 20 d in that blood sensors 20 e and 20 e ′ do not have electrode 31 , which is an Hct electrode.
- blood sensors 20 e and 20 e ′ have connection terminals 28 a to 30 a deriving from electrodes 28 to 30 , respectively, and contact parts 28 g to 30 g are arranged in connection terminals 28 a to 30 a , respectively.
- connection terminal 29 a has reference contact part 29 h in addition to contact part 29 g , and 29 h serves as a reference terminal. Therefore, four connectors are arranged in the blood test apparatus to which blood sensor 20 e is attached.
- Parts 28 g to 30 g and 29 h are preferably arranged near the outer periphery of blood sensor 20 e or 20 e ′ at equiangular intervals.
- a regular square may be formed with contact parts 28 g to 30 g and reference contact part 29 h .
- the reference contact part does not have to be provided in connection terminal 29 a but may be provided in any one of connection terminals 28 a to 30 a.
- the reference contact part 29 h can be specified by measuring the electrical resistance between reference contact part 29 h and each of contact parts 28 g to 30 g . That is, the electrical resistance between one of the contact parts and reference contact part 29 h becomes substantially zero, and so reference contact part 29 h can be specified.
- the connection terminals can be identified clockwise as connection terminals 29 a , 30 a and 28 a , and the arrangement of the connection terminals can be specified.
- Blood sensor 20 f shown in FIG. 10 is a hexagon, blood sensor 20 f may have other shapes.
- Blood sensor 20 f has electrode system including electrodes 28 to 31 and connection terminals 28 a to 31 a deriving from each electrode of the electrode system.
- Contact parts 28 g to 31 g are arranged in connection terminals 28 a to 31 a , respectively.
- blood sensor 20 f has electrode 33 , and two reference contact parts 33 h and 33 h ′, which serve as reference terminals, are arranged in electrode 33 .
- Contact parts 28 g to 31 g and reference contact parts 33 h and 33 h ′ are preferably arranged near the outer periphery at equiangular intervals.
- Six connectors are arranged in the blood test apparatus to which blood sensor 20 f is attached.
- connection terminals can be identified clockwise as connection terminals 31 a , 28 a , 29 a and 30 a , and the arrangement of the connection terminals can be specified.
- Blood sensor 20 preferably has an attaching guide.
- the attaching guide is a component for attaching blood sensor 20 at a predetermined position of the blood test apparatus.
- the predetermined position is a position where a plurality of connectors of the blood test apparatus are connected with contact parts of the connection terminals of the blood sensor and a contact part which serves as a reference terminal. Further, at the predetermined position, the plurality of connectors do not contact with the boundaries between the electrodes of the blood sensor.
- the connectors of the blood test apparatus preferably contact with the periphery of the axis of the blood sensor attached at the predetermined position.
- the axis of the blood sensor is near the axis of the rotation of the blood sensor when the blood sensor is inserted to the attaching part of the blood test apparatus. Further, the axis of the blood sensor may be near the center of the part where the blood sensor unit (which is, for example, a blood sensor or a cartridge including a blood sensor) and the attaching part of the blood test apparatus engage with each other.
- the axis of the blood sensor is usually inside storing part 24 on the surface of the substrate of the blood sensor.
- the attaching guide preferably adjusts as appropriate the rotation angle with respect to the axis of attached blood sensor 20 to the blood test apparatus. That is, the attaching guide may be (1) a guide that adjusts the rotation angle with respect to the axis of the blood sensor 20 to angles other than an undesirable angle, that is, the guide prevents blood sensor 20 from being led to certain undesirable positions, or (2) a guide that adjusts the rotation angle with respect to the axis to a predetermined angle, that is, leads blood sensor 20 to a predetermined position selectively.
- FIG. 11 to FIG. 15 show examples of combination of blood sensor 20 integrated with holder 80 having attaching guide 81 that prevents a blood sensor from being led to certain undesirable positions and attaching part 90 of the blood test apparatus to which blood sensor 20 is attached.
- a “certain undesirable position” refers to a position where the connectors of the blood test apparatus are placed at the boundaries between the electrodes (such as connection terminals and a dummy electrode) formed in blood sensor 20 , because, if the connectors of the blood test apparatus contact with the boundaries between the electrodes of blood sensor 20 , measurement is not possible.
- FIG. 16 and FIG. 17 show examples of combination of blood sensor 20 with holder 80 that leads blood sensor 20 to a predetermined position selectively, and attaching part 90 of the blood test apparatus, to which blood sensor 20 is attached.
- FIG. 11A shows blood sensor 20 d with holder 80 - 1 .
- Blood sensor 20 d is the same as the blood sensor shown in FIG. 8 , is a hexagon, and has four connection terminals 28 a to 31 a deriving from the four electrodes of the electrode system and dummy electrode 33 .
- Contact parts 28 g to 31 g are arranged in connection terminals 28 a to 31 a , respectively, contact part 33 g is arranged in dummy electrode 33 , and, further, reference contact part 30 h , which serves as a reference terminal, is arranged in connection terminal 30 a
- holder 80 - 1 is fixed and arranged so as to surround blood sensor 20 d and has one attaching guide 81 in its inner periphery.
- FIG. 11B shows attaching part 90 - 1 of the blood test apparatus to which blood sensor 20 d with holder 80 - 1 is attached.
- Attaching part 90 - 1 has six connectors 47 - 1 to 47 - 6
- attaching part 90 - 1 has six attaching guides 91 - 1 to 91 - 6 on the outer surface.
- Each of connectors 47 and attaching guides 91 are preferably arranged at equiangular intervals on the circle line.
- FIG. 11C and FIG. 11D show a state where blood sensor 20 d with holder 80 - 1 is attached to attaching part 90 - 1 of the blood test apparatus.
- attaching guide 81 on the inner surface of holder 80 - 1 and attaching guides 91 on the outer surface of attaching part 90 - 1 are defined by each other and prevents connectors 47 of the attaching part from being arranged on the boundaries between the connection terminals of blood sensor 20 d.
- reference terminal 30 h As described above, it is possible to specify reference terminal 30 h and specify the connection terminals based on reference terminal 30 h.
- FIG. 12A shows blood sensor 20 d with holder 80 - 2 .
- Holder 80 - 2 is the same as holder 80 - 1 in FIG. 11A in that holder 80 - 2 is arranged so as to surround blood sensor 20 d and has one attaching guide 81 in its inner periphery, but holder 80 - 2 is different from holder 80 - 1 in the positional relationship between attaching guide 81 and blood sensor 20 d .
- attaching part 90 - 2 shown in FIG. 12B is different from attaching part 90 - 1 shown in FIG. 11B in the positions of attaching guides 91 .
- Each of connectors 47 and attaching guides 91 of attaching part 90 - 2 are preferably arranged at equiangular intervals on the circle.
- attaching guide 81 of holder 80 - 2 and attaching guides 91 of attaching part 90 - 2 are defined by each other and prevents connectors 47 of attaching part 90 - 2 from being arranged on the boundaries between the connection terminals of blood sensor 20 d.
- FIG. 13A shows blood sensor 20 b ′ with holder 80 - 3 .
- Blood sensor 20 b ′ is the same as the blood sensor shown in FIG. 6 , is a quadrangle, and has four connection terminals 28 a to 31 a deriving from four electrodes 28 to 31 of the electrode system.
- Contact parts 28 g to 31 g are arranged in connection terminals 28 a to 31 a
- reference contact part 30 h which serves as a reference terminal, is arranged in connection terminal 30 a .
- holder 80 - 3 has one attaching guide 81 in its inner periphery.
- FIG. 13B shows attaching part 90 - 3 of the blood test apparatus to which blood sensor 20 b with holder 80 - 3 is attached.
- Attaching part 90 - 3 shown in FIG. 13B has five connectors 47 - 1 to 47 - 5 and five attaching guides 91 - 1 to 91 - 5 on the outer surface of attaching part 90 - 3 .
- Each of connectors 47 and attaching guides 91 of attaching part 90 - 3 are preferably arranged at equiangular intervals on the circle line.
- FIG. 13C and FIG. 13D show a state where blood sensor 20 b ′ with holder 80 - 3 is attached to attaching part 90 - 3 of the blood test apparatus.
- projection 81 on the inner surface of holder 80 - 3 and attaching guides 91 on the outer surface of attaching part 90 - 3 are defined by each other and prevents connectors 47 of attaching part 90 - 3 from contacting with the boundaries between the connection terminals of the blood sensor.
- FIG. 14A shows blood sensor 20 f with holder 80 - 4 .
- Blood sensor 20 f is the same as the blood sensor shown in FIG. 10 , is a hexagon, and has four connection terminals 28 a to 31 a deriving from the four electrodes of the electrode system and electrode 33 .
- Contact parts 28 g to 31 g are arranged in connection terminals 28 a to 31 a , respectively, and, further, contact part 33 h , which serves as a reference terminal, is arranged in electrode 33 .
- holder 80 - 4 has one attaching guide 81 in its inner periphery.
- FIG. 14B shows attaching part 90 - 4 of the blood test apparatus to which blood sensor 20 f with holder 80 - 4 is attached.
- Attaching part 90 - 4 shown in FIG. 14B has six connectors 47 - 1 to 47 - 6
- attaching part 90 - 4 has six attaching guides 91 - 1 to 91 - 6 on the outer surface of the attaching part.
- Each of connectors 47 and a projecting part of attaching part 90 - 4 are preferably arranged at equiangular intervals on the circle line.
- attaching guides 81 on the inner surface of holder 80 - 4 and one attaching guide 91 on the outer surface of attaching part 90 - 4 .
- FIG. 14C and FIG. 14D show a state where blood sensor 20 f with holder 80 - 4 is attached to attaching part 90 - 4 of the blood test apparatus.
- Four connectors ( 47 - 3 to 47 - 6 ) out of six connectors 47 of attaching part 90 - 4 contact with contact parts 28 g to 31 g of connection terminals 28 a to 31 a , respectively, and the remaining two connectors ( 47 - 1 and 47 - 2 ) contact with two reference contact parts 33 h and 33 h ′, respectively.
- projection 81 on the inner surface of holder 80 - 4 and attaching guides 91 on the outer surface of attaching part 90 - 4 are defined by each other and prevent connectors 47 from contacting with the boundaries between the connection terminals of blood sensor 20 f.
- the resistance between two reference terminals 33 h and 33 h ′ becomes zero, and so reference terminals can be specified, and, further the connection terminals can be specified.
- FIG. 15A shows blood sensor 20 e with holder 80 - 5 .
- Blood sensor 20 e is the same as the blood sensor shown in FIG. 9A , is a quadrangle, and has connection terminals 28 a to 30 a deriving from three electrodes 28 to 30 of the electrode system.
- Contact parts 28 g to 30 g are arranged in connection terminals 28 a to 30 a , respectively, and, further, reference contact part 29 h which serves as a reference terminal, is arranged in connection terminal 29 a .
- holder 80 - 5 is fixed and arranged so as to surround blood sensor 20 e and has one attaching guide 81 in its inner periphery.
- FIG. 15B shows attaching part 90 - 5 of the blood test apparatus to which blood sensor 20 e with holder 80 - 5 is attached.
- Attaching part 90 - 5 has four connectors 47 - 1 to 47 - 4 and four attaching guides 91 - 1 to 91 - 4 on the outer surface.
- Each of connectors 47 and attaching guides 91 of attaching part 90 - 5 are preferably arranged at equiangular intervals on the circle line.
- FIG. 15C and FIG. 15D show a state where blood sensor 20 e with holder 80 - 5 is attached to attaching part 90 - 5 of the blood test apparatus.
- Three connectors ( 47 - 1 , 47 - 2 and 47 - 3 or 47 - 4 ) out of four connectors 47 of attaching part 90 - 5 contact with contact parts 28 g to 30 g of connection terminals 28 a to 30 a , respectively, and the remaining one connector ( 47 - 4 or 47 - 3 ) contacts with reference contact part 29 h.
- attaching guide 81 on the inner surface of holder 80 - 5 and attaching guides 91 on the outer surface of attaching part 90 - 5 are defined by each other, so that it is possible to prevent connectors of attaching part 90 - 5 from contacting with the boundaries between the connection terminals of blood sensor 20 f.
- FIG. 16A shows blood sensor 20 d with holder 80 - 6 .
- Blood sensor 20 d is the same as the blood sensor shown in FIG. 8 , is a hexagon, and has four connection terminals 28 a to 31 a deriving from four electrodes 28 to 31 of the electrode system and dummy electrode 33 .
- Contact parts 28 g to 31 g are arranged in connection terminals 28 a to 31 a , respectively, contact part 33 g is arranged in dummy electrode 33 , and, further, reference contact part 33 h , which serves as a reference terminal, is arranged in connection terminal 30 a .
- holder 80 - 6 has six attaching guides 81 - 1 to 81 - 6 in its inner periphery. Attaching guides 81 are arranged at equiangular intervals and have the same shape.
- FIG. 16B shows attaching part 90 - 6 of the blood test apparatus to which blood sensor 20 d with holder 80 - 6 is attached.
- Attaching part 90 - 6 shown in FIG. 16B has six connectors 47 - 1 to 47 - 6
- attaching part 90 - 6 has six attaching guides 91 - 1 to 91 - 6 on the outer surface of the attaching part.
- Attaching guides 91 of attaching part 90 - 6 are all arranged at equiangular intervals and have the same shape.
- FIG. 16C shows a state where blood sensor 20 d with holder 80 - 6 is attached to attaching part 90 - 6 of the blood test apparatus.
- Attaching guides 81 on the inner surface of holder 80 - 6 and attaching guides 91 on the outer surface of attaching part 90 - 6 are engaged and fixed, and thereby blood sensor 20 d is attached to attaching part 90 - 6 .
- Attaching guides 81 and attaching guides 91 are arranged at equiangular intervals and have the same shape, so that attaching guide 81 and attaching guide 91 can be engaged with each other at six positions (see FIG. 17C to FIG. 17H ).
- FIG. 16 compared to a case where a holder that prevents the blood sensor from being arranged at undesirable parts (parts that contact with the boundaries between the connection terminals) as shown in FIG. 10 to FIG. 15 , use of a holder that attaches blood sensor 20 at a predetermined position selectively can provide the following advantages.
- FIG. 17 shows (six types of) states where blood sensor 20 d ( FIG. 17A : the same as FIG. 16A ) is attached to attaching part 90 - 7 ( FIG. 17B ) with connectors 47 - 1 to 47 - 6 arranged not at equiangular intervals but at unequiangular intervals ( FIG. 17C to FIG. 17H ). Even if the blood sensor is attached in any of the states, connectors 47 - 1 to 47 - 6 of attaching part 90 - 7 contact with predetermined parts in blood sensor 20 d.
- a plurality of connectors of the blood test apparatus may contact and connect with the connection terminals and reference terminal of the blood sensor directly, or may connect through wiring.
- the blood sampling cartridge may be configured with the blood sensor and the holder in an integrated manner and wirings from the connection terminals and reference terminal of the blood sensor may be installed in the holder.
- the connectors of the blood test apparatus may be connected with the connection terminals and reference terminal of the blood sensor by contacting with the above-described wirings.
- Blood sensor 20 may be configured integrated with the holder, which is part of the blood sampling cartridge.
- the holder of the blood sampling cartridge may be provided with a function of holder 80 described above.
- FIG. 18A is a diagrammatic perspective view showing blood sampling cartridge 61 including integrated blood sensor 20 and holder 60 , and attaching part 41 a (with connectors 47 ) of the blood test apparatus to which blood sampling cartridge 61 is attached.
- holder 60 preferably includes projecting part 60 a that abuts on the punctured part in addition to blood sensor 20 .
- FIG. 18B shows holder 60 divided into first holder 60 b and second holder 60 c (with projecting part 60 a ) and blood sampling cartridge 61 including blood sensor 20 sandwiched between first holder 60 b and second holder 60 c .
- First holder 60 b , second holder 60 c and blood sensor 20 may be separable from each other.
- Blood sampling cartridge 61 is attached to attaching part 41 a (with connectors 47 ) of the blood test apparatus.
- FIG. 18C shows blood sampling cartridge 61 including holder 60 with projecting part 60 a and blood sensor 20 attached to holder 60 .
- Holder 60 and blood sensor 20 may be separable.
- Blood sampling cartridge 61 is attached to attaching part 41 a (with connectors 47 ) of the blood test apparatus. If holder 60 and blood sensor 20 are separable, the blood sensor can be changed singly, but the steps of manufacturing process may increase.
- FIG. 18D shows blood sampling cartridge 61 including holder 60 with projecting part 60 a and blood sensor 20 which is configured integrated with holder 60 and which cannot be separated. Blood sampling cartridge 61 is attached to attaching part 41 a (with connectors 47 ) of the blood test apparatus.
- FIG. 19A shows blood sampling cartridge 61 having holder 60 with projecting part 60 a and blood sensor 20 configured integrated with holder 60 . Further, blood sampling cartridge 61 has terminals 63 connected with terminals (such as connection terminals) of blood sensor 20 through wiring 62 . Further, holder 60 is provided with concave portion 60 d for controlling the attachment position.
- attaching part 41 a of the blood test apparatus to which blood sampling cartridge 61 is attached has connector 47 and convex portion 41 i for controlling the attachment position. Connector 47 is urged by an elastic body such as spring and can be forced into attaching part 41 a (see FIG. 19C to FIG. 19E ). Convex portion 41 i and concave portion 60 d are engaged, so that connector 47 can contact with terminal 63 .
- Blood sampling cartridge 61 and attaching part 41 a shown in FIG. 19B are the same as the blood sampling cartridge and attaching part shown in FIG. 19A except that (1) connector 47 and convex portion 41 i in attaching part 41 a are not on the same circle and (2) terminal 63 arranged in holder 60 of blood sampling cartridge 61 and concave portion 60 d are not on the same circle.
- FIG. 19C is a cross-sectional view of blood sampling cartridge 61 including: holder 60 ; blood sensor 20 configured integrated with holder 60 ; wiring 62 from the connection terminals of blood sensor 20 provided inside holder 60 ; and terminal 63 which is connected with wiring 62 and exposed.
- Connector 47 of attaching part 41 a is connected to terminal 63 which is connected with the electrode of blood sensor 20 through wiring 62 .
- Connector 47 of attaching part 41 a is urged toward the attaching part side (blood sensor side).
- Connectors 47 may be urged by elastic body 41 j (such as spring) arranged in attaching part 41 a.
- FIG. 19D shows a state where blood sampling cartridge 61 is attached to attaching part 41 a of the blood test apparatus. Concave portion 60 d of blood sampling cartridge 61 and convex portion 41 i of attaching part 41 a are engaged, so that blood sampling cartridge is inserted to an appropriate depth and connector 47 can contact with holder terminal 63 . On the other hand, as shown in FIG. 19E , if concave portion 60 d and convex portion 41 i are not engaged, connector 47 cannot contact with holder terminal 63 .
- FIG. 20 is a diagrammatic perspective view showing an example of a blood sampling cartridge including integrated blood sensor 20 , a puncturing means (including a lancet and blood collection needle) and a holder.
- a puncturing means including a lancet and blood collection needle
- the height of cross-shaped convex portion 43 c formed on the one end 43 a side (blood sensor 20 side) of holder 43 is higher than the height of cross-shaped convex portion 43 d formed on the other end 43 b side of holder 43 . That is, holder 43 is thinner at convex portion 43 d side than at the convex portion 43 c side.
- blood sampling cartridge 42 can be inserted into the attaching part of the blood test apparatus in a simple manner. Further, tip end 43 g (the 43 b side) of convex portion 43 d at the other end 43 b side projects with a sharp angle, and functions as an attaching guide (described above) to the attaching part of the blood test apparatus.
- the whole of blood sampling cartridge 42 can be attached to and removed from the attaching part, and so puncturing needle 32 and blood sensor 20 can be attached to and removed from the attaching part together. Therefore, blood sensor 20 and puncturing needle 32 can be attached and changed in a simple manner.
- FIG. 21 is a diagrammatic perspective view of assembly of an example of the blood sampling cartridge.
- Blood sampling cartridge 42 has: cylinder-shaped holder 43 ; blood sensor 20 that is attached to one end 43 a of holder 43 ; lancet 45 that can slide inside holder 43 freely; and needle 32 that is attached to the other end 45 b of lancet 45 .
- Connector 47 is preferably in the blood test apparatus. For example, eight connectors (four pairs of connectors) in the case of blood sensor 20 a , five connectors in the case of blood sensor 20 b , 20 b ′ or 20 c , six connectors in the case of blood sensor 20 d or 20 f , and four connectors in the case of blood sensor 20 e , are arranged in the blood test apparatus.
- Blood sensor 20 is attached to one end 43 a of holder 43 .
- the outer surface of holder 43 in FIG. 21 has a cross shape, and connector 47 formed with conductive metal (in the blood test apparatus) is led between cross-shaped convex portion 43 c . Therefore, four connectors are led to blood sampling cartridge 42 .
- the other end of holder 43 has another convex portions 43 d formed integrated with convex portion 43 c , and convex portion 43 d has hole 43 e.
- Lancet 45 is inserted into holder 43 .
- Guides 45 c for preventing reuse, are provided 180 degrees apart from each other in lancet 45 .
- guides 45 d for improving linear mobility are provided between guides 45 c 180 degrees apart from each other in lancet 45 .
- Guide 45 d is provided so as to slide in hole 43 e .
- Guide 45 c and guide 45 d are formed integrated with lancet 45 .
- Convex portion 45 e is provided near one end 45 a of lancet 45
- grip part 45 f is provided between convex portion 45 e and one end 45 a.
- FIG. 22A is a cross-sectional view of blood sampling cartridge 42 upon puncturing
- FIG. 22B is a cross-sectional view of blood sampling cartridge 42 after puncturing is finished.
- puncturing needle 32 projects from blood sensor 20 and stays.
- convex portion 45 e of lancet 45 is latched at latch part 43 f provided at the other end 43 b of holder 43 . Therefore, puncturing needle 32 does not further project from the blood sensor.
- FIG. 22B when puncturing is finished, puncturing needle 32 is accommodated in holder 43 and stays.
- the base of guide 45 c of lancet 45 is latched at latch part 43 f provided at the other end 43 b of holder 43 . Therefore, lancet 45 does not fall off from holder 43 .
- holder 43 of cartridge 42 preferably has a function of an attaching guide for attaching blood sensor 20 to attaching part 41 a of the blood test apparatus.
- FIG. 23 is a plan view that expands the main part of an example of the attaching part for attaching cartridge 42 with blood sensor 20 to attaching part 41 a of the blood test apparatus.
- Convex portion 43 d formed in holder 43 functions as attaching guide.
- Convex portion 41 f is formed inside attaching part 41 a of the blood test apparatus.
- Tip part 41 g of convex portion 41 f and tip part 43 g of convex portion 43 d preferably have a sharp angle.
- convex portion 43 d and convex portion 41 f face each other, and, even if the relative position is shifted, cartridge 42 is attached while its angle is modified as shown by arrow 57 .
- the contact parts arranged in the blood sensor of cartridge 42 and the connectors of the blood test apparatus contact reliably.
- FIG. 24 is a cross-sectional view of attaching part 41 a of the blood test apparatus to which cartridge 42 is attached.
- cartridge 42 is attached with the help of the attaching guide, so that convex portion 41 f and convex portion 43 d are engaged, the angle of cartridge 42 is modified to a predetermined angle, and cartridge 42 is fixed inside attaching part 41 a .
- connector 47 contacts with the contact part of blood sensor 20 reliably and transmit a signal of blood sensor 20 to measuring circuit 52 reliably.
- FIG. 25 is a cross-sectional view of cartridge 42 and attaching part 41 a into which this cartridge 42 is inserted.
- FIG. 25A shows a state where plunger 50 is pulled backward, and puncturing needle 32 is in cartridge 42 . That is, FIG. 25A shows a state before puncturing.
- FIG. 25B shows a state where plunger 50 projects forward, and puncturing needle 32 breaks through cover 23 of sensor 20 and punctures the skin of the patient.
- FIG. 25C shows a state where plunger 50 is pulled backward, and puncturing needle 32 is accommodated in cartridge 42 . In this way, except for the state where plunger 50 projects forward, puncturing needle 32 is accommodated in cartridge 42 .
- FIG. 26 is a cross-sectional view of blood test apparatus 40 .
- Blood test apparatus 40 has housing 41 formed with resin. Housing 41 is a frame of the apparatus and accommodates main members of the apparatus.
- housing 41 One side of housing 41 is attaching part 41 a .
- Blood sampling cartridge 42 is preferably inserted into end 41 b of attaching part 41 a .
- Positioning concave portion 41 h provided on the attaching part 41 a side and positioning convex portion 43 h provided at holder 43 on the blood sampling cartridge 42 side are engaged, and thereby blood sampling cartridge 42 inserted to attaching part 21 a is fixed to a predetermined position in attaching part 41 a (position in a horizontal direction in FIG. 26 ).
- Blood sampling cartridge 42 has: cylinder-shaped holder 43 ; blood sensor 20 that is attached to one end 43 a of holder 43 ; lancet 45 that can slide inside holder 43 freely; and puncturing needle 32 that is attached to the other end 45 b of lancet 45 .
- Blood sensor 20 includes electrodes and connection terminals connected to the electrodes. Connector 47 contacts with the connection terminal.
- Plunger 50 holds lancet 45 , so that, when the skin is punctured with puncturing needle 32 , puncturing needle 32 does not shake and enables high linearity of movement, so that it is possible to puncture the skin with puncturing needle 32 stably.
- the other end 50 b of plunger 50 is connected to one end 51 a of handle 51 formed in the shape of a crank.
- Latch convex portion 51 c is formed at the other end 51 b of handle 51 .
- Handle 51 goes through hole 41 c formed in housing 41 and is latched by the joint of latch convex portion 51 c and latch concave portion 41 d.
- a puncturing needle can move straight backward and stay after puncturing, so that it is possible to alleviate the pain of the patient upon puncturing to a minimum, and, further, accomplish a mechanism for preventing the blood collection needle from puncturing the patient's skin several times and adjusting the depth of puncturing, in a simple manner.
- a prevention mechanism and an adjustment mechanism on the blood test apparatus, instead of providing on the blood sampling cartridge, it is possible to realize a smaller and lower-cost blood sampling cartridge.
- a pull string one end of which is fixed, has the other end hooked on a lever for which rotation is partially limited and which is provided in the plunger.
- a forward force is given to the plunger by a contracting and restoring force of the pull string.
- the plunger passes the position where the forward force is no longer given then the plunger moves on by inertia. In this case, the pull string is extended again with the help of the lever as fulcrum, and the plunger is given a force towards the rear end by the restoring force of the pull string.
- puncturing depth adjusting knob 84 that limits the amount of move and that has a receiving part, is jointed rotatably (see FIG. 34 ).
- the receiving part (not shown) of puncturing depth adjusting knob 84 has a helical shape.
- Measuring circuit 52 is accommodated inside the other end 41 e side of housing 41 .
- Measuring circuit 52 is connected to terminal 53 formed in attaching part 41 a .
- terminal 53 is connected to connector 47 .
- Terminal 53 is configured with two or more (usually, four or five) terminals 53 a to 53 d (or 53 e ) and connected to matching connectors 47 a to 47 d (or 47 e ). As described above, connectors 47 contact with matching connection terminals, respectively.
- the housing accommodates battery 54 that supplies power to measuring circuit 52 .
- blood test apparatus 40 has blood sampling cartridge 42 that is integrated with built-in lancet 45 with puncturing needle 32 attached and built-in blood sensor 20 , and blood sampling cartridge 42 can be attached to and removed from attaching part 41 a . Therefore, the whole of blood sampling cartridge 42 , including the puncturing needle and the blood sensor, can be changed in a simple manner. Further, blood sensor 20 and puncturing needle 32 are changed together every test, so that there is no fear that puncturing needle is used several times and there is no threat of infection.
- Puncturing needle 32 of blood sampling cartridge 42 is accommodated in holder 43 upon attachment, so that puncturing needle 32 does not hurt the patient and is secure and does not make the patient feel fear. Further, puncturing needle 32 accommodated in holder 43 does not allow direct touch, and so is sanitary.
- FIG. 27 shows an example of the flow of the test using blood test apparatus 40 .
- blood sampling cartridge 42 is inserted to attaching part 41 a and attached to blood test apparatus 40 .
- holder 43 is pressed into attaching part 41 a and latched, and positioning concave portion 41 h and positioning convex portion 43 h are jointed to determine the position.
- grip part 45 f of lancet 45 is held by holding part 50 a of plunger 50 .
- connection terminals of blood sensor 20 are specified.
- resistance values between the contact parts in pairs between 28 c to 31 c and 28 d to 31 d
- reference terminal 29 f is specified.
- connection terminals 28 a to 31 a are specified.
- electrodes 28 to 30 of the electrode system are also specified.
- step 113 the patient's skin is pressed with blood sensor 20 of blood sampling cartridge 42 and blood sensor 20 is placed in close contact with the patient's skin.
- step 114 a locking mechanism of plunger 50 , formed by latch convex portion 51 c provided at handle 51 and latch concave portion 41 d provided at housing 41 , is disengaged.
- puncturing needle 32 attached to lancet 45 projects toward the skin by plunger 50 urged by the spring.
- step 115 after the patient's skin is punctured with puncturing needle 32 , puncturing needle 32 is moved backward and accommodated inside blood sampling cartridge 42 .
- step 116 blood flows out and is sampled. The blood flowing out is brought to blood sensor 20 and led to detecting section 27 placed inside supply channel 25 . After electrode 29 as a detecting electrode determines that blood of the amount necessary for measurement is led to the detecting section, sampling blood is finished. In this way, blood is not over-sampled, so that it is possible to alleviate the load on the patient significantly.
- a warning means may be activated for warning, and the measure may be displayed on a display section.
- step 117 the glucose in the sampled blood is measured. After the glucose in the blood and a glucose oxidation-reduction enzyme are reacted for a certain period, a voltage is applied between electrode 28 as a working electrode and electrode 30 as a counter electrode. The mediator in a reduction condition, produced on electrode 28 by enzyme reaction, is oxidized, and its oxidation current is measured.
- the reaction time of a glucose and an oxidation-reduction enzyme is normally 10 seconds or less, the voltage applies in step 117 is normally 0.2 to 0.5V, and the application time is normally 5 seconds or less. This application time is measured by timer 79 (described later).
- the hematocrit (Hct) level is measured.
- a voltage is applied between electrode 31 as a working electrode and electrode 30 as a counter electrode, a current that depends on the Hct level is measured.
- the Hct level is measured based on the detected current.
- the measured Hct level is utilized to correct the result of measuring the glucose.
- the relationship between the current and the Hct level may be calculated in advance as a calibration curve, and the measured current may be applied as it is.
- the voltage applied in step 118 is approximately 2 to 3 V, and the application time is approximately 5 seconds or less.
- a mediator is not provided at electrode 31 , which is a working electrode. There is a certain interval between electrode 31 and electrode 30 , and only blood exists in this interval. Therefore, in step 118 , an oxidation current that depends on the Hct level can be measured without being influenced by reagent 10 .
- step 119 the measurement result of the blood components is corrected. That is, using the Hct level measured in step 118 , the glucose content calculated in step 117 is corrected. This correction is performed based on the calibration curve (including a calibration table) created in advance. The corrected glucose content is displayed on display section 75 of blood test apparatus 40 .
- used blood sampling cartridge 42 After going through steps 117 , 118 and 119 of blood sugar level measurement, used blood sampling cartridge 42 is collected or discarded every measurement.
- FIG. 28 shows the measurement principle of blood test apparatus 40 that measures the blood sugar level of blood.
- Glucose 101 in blood reacts with glucose dehydrogenase (GDH) 103 specifically and product 102 is given, and potassium ferricyanide 104 is reduced and potassium ferrocyanide 105 is generated.
- the amount of generated potassium ferrocyanide 105 is proportional to the concentration of glucose 101 .
- Potassium herrocyanide 105 is oxidized on electrode 28 (see FIG. 4 and the like) as a working electrode, and, at this time, oxidation response current 106 flowing electrode 30 as a counter electrode is proportional to the concentration of glucose 101 . Therefore, the blood sugar level can be measured based on this oxidation response current 106 .
- FIG. 29 shows an output example of the measurement result of blood test apparatus 20 .
- the horizontal axis shows the concentration (mg/dL) of glucose 101
- the vertical axis shows response current 106 ( ⁇ A).
- oxidation response current 106 is proportional to the concentration of glucose 101 .
- FIG. 30 is a block diagram of blood test apparatus 52 .
- Blood test apparatus 52 in FIG. 30 has blood sensor 20 b .
- Connection terminals 28 a to 31 a and reference terminal 29 h of blood sensor 20 b are connected to terminals 53 a to 53 e via connectors.
- Terminals 53 a to 53 e are connected to switch circuit 71 , and the output of switch circuit 71 is connected to the input of current/voltage converter 72 .
- the output of current/voltage converter 72 is connected to the input of calculating section 74 via analogue/digital converter (hereinafter A/D converter) 73 .
- A/D converter analogue/digital converter
- the output of calculating section 74 is connected to display section (for example, a liquid crystal display device) and also connected to the input of transmitting section 77 . Further, reference voltage supply 78 is connected to switch circuit 71 . Reference voltage supply 78 may be a ground potential.
- the output of controlling section 76 is connected to a control terminal of switch circuit 71 , calculating section 74 , transmitting section 77 and timer 79 .
- a warning means (not shown) may be connected to the output of controlling section 76 .
- connection terminals 28 a to 31 a are connected to (via connectors), before measuring the blood components. Therefore, by the command of controlling section 76 , out of terminals 33 a to 33 e , terminals having conductivity with the neighboring terminals are specified. If a terminal having conductivity is specified, the electrode connected to the terminal is determined to be connection terminal 29 a . Using the terminal connected to connection terminal 29 a as a reference, terminals connected to connection terminals 30 a , 31 a and 28 a , are determined in that order. In this way, after the terminals connected to connection terminals 28 a to 31 a are determined, the blood components are measured.
- switch circuit 71 is switched, and electrode 28 as a working electrode for measuring the amount of blood components is connected to current/voltage converter 72 via terminal 53 .
- electrode 29 which serves as a detecting electrode for detecting the inflow of blood is connected to reference voltage supply 78 via terminal 53 .
- a certain voltage is applied between electrode 28 and electrode 29 .
- a current flows between electrode 28 and electrode 29 .
- This current is converted to a voltage by current/voltage converter 72
- the voltage value is converted to a digital value by A/D converter 73 .
- the digital value is then outputted to calculating section 74 .
- Calculating section 74 detects the inflow of blood based on the digital value.
- the glucose content is measured by, first, switching switch circuit 71 by the command of controlling section 76 and connecting electrode 28 , which is a working electrode for measuring the glucose content, to current/voltage converter 72 via terminal 53 .
- electrode 30 which is a counter electrode for measuring the glucose content, is connected to reference voltage supply 78 via terminal 53 .
- current/voltage converter 72 and reference voltage supply 78 may be turned off. If a certain voltage (0.2 to 0.5 V) is applied between electrode 28 and 30 by the command of controlling section 76 after the glucose in the blood and the oxidation-reduction enzyme are reacted for a certain period (10 seconds or less), a current flows between electrode 28 and electrode 30 . This current is converted to a voltage by current/voltage converter 72 , and the voltage value is converted to a digital value by A/D converter 73 and outputted to calculating section 74 . Calculating section 74 converts the digital value to a glucose content.
- a certain voltage 0.2 to 0.5 V
- the Hct level is measured.
- switch circuit 71 is switched to connect electrode 31 , which is a working electrode for measuring the Hct level, to current/voltage converter 72 via terminal 53 .
- electrode 28 which is a counter electrode for measuring the Hct level, is connected to reference voltage supply 78 .
- a certain voltage (2 to 3 V) is applied between electrode 31 and electrode 28 from current/voltage converter 72 and reference voltage supply 78 .
- the current flowing between electrode 31 and electrode 28 is converted to a voltage by current/voltage converter 72 , and the voltage value is converted to a digital value by A/D converter 73 and outputted to calculating section 74 .
- Calculating section 74 measures the Hct level based on the digital value.
- the glucose content is corrected with the Hct level.
- the result after correction may be displayed on display section 75 or transmitted to an injection apparatus that injects a curative drug (for example, insulin) from transmitting section 77 .
- the result after correction may be transmitted by radio, but is preferably transmitted using optical communication which does not interfere with medical equipment.
- the injection apparatus for injecting curative drug can set a dose of the curative drug automatically based on the result after correction (measured data) transmitted from transmitting section 77 , the patient does not have to set a dose of the curative drug, which eliminates the inconvenience of setting a dose. Further, the amount of insulin can be set for the injection apparatus without involving an artificial means, so that it is possible to prevent setting errors.
- the blood test apparatus of the present invention may have a negative pressure means.
- a negative pressure is preferably applied near the part of the skin punctured with puncturing needle 32 . Therefore, blood test apparatus 40 having the negative pressure means preferably has a member for surrounding the neighborhood of the punctured part of the skin, and may apply a negative pressure to the space surrounded by the member.
- FIG. 31 is a block diagram of blood test apparatus 52 a having a negative pressure means.
- Blood test apparatus 52 a is different from blood test apparatus 52 shown in FIG. 30 in that blood test apparatus 52 has a negative pressure means, and so the difference will be mainly described.
- the same components as blood test apparatus 52 will be assigned the same reference numerals for ease of explanation.
- guard part 131 is provided, which extends from 41 b of attaching part 41 a .
- Controlling section 76 a is connected to negative pressure means 82 (for example, a vacuum generator), and the output of negative pressure means 82 is connected inside of guard part 131 via negative pressure path 83 . Therefore, negative pressure can be supplied inside of guard part 131 by negative pressure means 82 .
- Negative pressure means 82 may be started after step 111 in which blood sensor 20 a is brought into close contact with the measurement part, and stay after step 116 in which blood is sampled. Upon sampling blood, by supplying a negative pressure between the skin punctured with the puncturing needle and blood sensor 20 b , the skin is put under a state of tension so as to enable fast and reliable blood sampling.
- FIG. 32 is a cross-sectional view of blood test apparatus 52 a .
- guard part 131 is provided which extends from end 41 b of attaching part 41 a .
- the output of negative pressure means 82 (for example, a vacuum generator) connected to controlling section 76 a is connected inside guard part 131 via negative pressure path 83 . Therefore, negative pressure means 82 can supply a negative pressure inside guard part 131 .
- FIG. 33 is a cross-sectional view that expands the main part near guard part 131 of blood test apparatus 52 a .
- inner part 131 a of guard part 131 is sucked in as shown by arrow 83 a
- skin 7 is brought in close contact with sensor 20 of guard part 131 and put under a state of tension.
- inner part 42 a of blood sampling cartridge 42 is also sucked in.
- skin 7 is preferably lifted by sucking in the inner part of storing part 24 in a direction of arrow 83 b by supplying a negative pressure from air hole 26 .
- air hole 26 and supply channel 25 are also used as negative pressure supply channels, so that it is possible to supply a negative pressure to the inner part of storing part 24 without providing a negative pressure supply channel separately. Further, after puncturing, puncturing hole 36 can be also used as a negative pressure supply channel.
- FIG. 34 shows a state where the patient tries to examine blood using blood test apparatus 40 .
- the patient is trying to sample the blood from the index finger of the patient's left hand and measure blood components (for example, the blood sugar level).
- attaching part 41 a is provided on one side of housing 41 .
- Blood sampling cartridge 42 is inserted and fixed at attaching part 41 a , and blood sensor 20 is attached to one end of blood sampling cartridge 42 .
- display section 75 is provided on the other side of housing 41 .
- As a mechanism for driving a plunger for example, the method disclosed in Japanese Patent Application Laid-Open No. 2006-314718 can be adopted.
- blood test apparatus 40 may have a mechanism for adjusting the depth of puncturing, and, as an example of this mechanism, FIG. 34 shows puncturing depth adjusting control 84 .
- the blood test apparatus of the present invention can be used to measure glucose, and also is suitable for measuring blood components such as the lactate level and cholesterol.
- a blood sampling cartridge including a puncturing needle and a blood sensor can be attached and removed in a simple manner, and is applicable to medical equipment, and the like.
Abstract
Description
- This application is a division of application Ser. No. 12/162,612, filed Jul. 30, 2008, which was the National Stage of International Application No. PCT/JP2007/051508, filed Jan. 30, 2007.
- The present invention relates to a blood sensor and a blood test apparatus with the blood sensor.
- Diabetes patients need to measure the blood sugar level (glucose level) regularly, and inject insulin based on the blood sugar level to maintain a normal blood sugar level. To maintain a normal blood sugar level, diabetes patients need to measure the blood sugar level frequently, sample a small amount of blood from fingertips of the patients using a blood test apparatus, and measure the blood sugar level using this sampled blood and a blood sensor for examining blood.
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FIG. 35 is a cross-sectional view showing an example of a conventional blood sensor (seePatent Document 1, for example).Blood sensor 1 shown inFIG. 35 is configured with:substrate 3;spacer 4 provided on the upper surface ofsubstrate 3; andcover 5 provided on the upper surface ofspacer 4.Blood storing part 6 is provided so as to penetratesubstrate 3 andspacer 4 andblood storing part 6 opens toward the side that abuts on the skin (downward in the figure). One end ofblood supply channel 8 is connected to storingpart 6 and the other end is connected toair hole 9.Blood detecting section 2 is formed inblood supply channel 8, andreagent 10 is placed on detectingsection 2. -
FIG. 36A is a perspective plan view ofblood sensor 1 seen from above (from thecover 5 side). In the blood sensor shown inFIG. 36A , workingelectrode 14 b andcounter electrode 14 c function as detection electrodes and form detectingsection 2. Further, the blood sensor shown inFIG. 36B is also known (see Patent Document 2). Also in the blood sensor shown inFIG. 36B , workingelectrode 14 b andcounter electrode 14 c function as detection electrodes and form detectingsection 2. - The way to use
blood sensor 1 will be described usingFIG. 37 .FIG. 37 shows a state whereneedle 11 is pulled up and stays in its original position after blood sampling is finished. First,sensor 1 is brought into contact withskin 7 of the patient. Next, puncturingneedle 11 is propelled in the direction ofarrow 12.Puncturing needle 11 breaks throughcover 5 formingupper side 6 a of storingpart 6, forms puncturinghole 14 inupper side 6 a, and, further, penetrates puncturinghole 14 andscars skin 7.Blood 13 flows out fromskin 7 where a scar is made. The outflowingblood 13 fills storingpart 6.Blood 13 that fills storingpart 6 is led to detectingsection 2 throughsupply channel 8 by capillary action. - Then,
blood 13 between workingelectrode 14 b andcounter electrode 14 c reacts withreagent 10 and produces a current proportional to the blood sugar level. The current produced is led to a measuring circuit in the blood test apparatus via a connector that contacts withconnection terminal 15 b and a connector that contacts withconnection terminal 15 c. The measuring circuit measures the current proportional to the blood sugar level and calculates the blood sugar level. The calculated blood sugar level provides basic data and the like showing the amount of insulin to administer to the patient. - To measure the blood sugar level using
blood sensor 1 in this way, signals fromdetection electrode 14 b anddetection electrode 14 c have to be transmitted to the measuring circuit in the blood test apparatus reliably via the connectors. - Patent Document 1: Japanese Patent Application Laid-Open No. 2005-110712
- Patent Document 2: Japanese Patent Application Laid-Open No. 2000-000231
- When attached to a blood test apparatus, the conventional blood sensor needs to be adjusted its angle of attachment to contact with the connectors of the blood test apparatus at desired positions. Particularly, in recent years, in addition to a working electrode and a counter electrode, a detecting electrode and an Hct electrode (described later) are also going into use as electrode system of a blood sensor. Therefore, to connect the connectors to the connection terminals of the electrode system adequately, it is necessary to adjust their angle of attachment more precisely. For example, if an approximate round blood sensor is attached to a blood test apparatus casually, it is not clear whether connection terminal contacts with the connector, or it is not possible to specify with which of the connectors each connection terminal contacts, and so blood sugar level measurement is not possible. Therefore, the blood sensor may be attached by adjusting the angle of the blood sensor and adjusting the attachment position to a desired position with eyes, using a mark and the like as a reference. However, this attaching work becomes a burden for the patient. Particularly, this work becomes a great burden for diabetes patients with poor eyesight.
- It is therefore an object of the present invention to provide a blood sensor that can be attached to a blood test apparatus in a simple manner.
- The blood sensor of the present invention is characterized in that the blood sensor has a reference terminal which serves as a reference for identifying each of a plurality of connection terminals. For example, the blood sensor of the present invention has: a reference terminal whose electrical resistance with one of the plurality of connection terminals is adjusted to a predetermined value; or two or more reference terminals electrically connected with each other via a conductor.
- The blood sensor of the present invention has a reference terminal that serves as a reference for identifying each of a plurality of connection terminals, and specifies the individual connection terminals based on the reference terminal. Therefore, the connection terminals can be identified automatically, and the conventional adjustment of the attachment position with eyes is not necessary for attaching the blood sensor, so that the attaching work becomes extremely simple.
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FIG. 1A is a cross-sectional view of a blood sensor not having a hole in a cover for a puncturing needle to pass through; -
FIG. 1B is a cross-sectional view of a blood sensor with a hole in a cover for a puncturing needle to pass through; -
FIG. 2 is a cross-sectional view showing a state where blood is brought in the blood sensor; -
FIG. 3A is a plan view of the cover; -
FIG. 3B is a plan view of the spacer; -
FIG. 3C is a plan view of the substrate; -
FIG. 4 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal insulated from a connection terminal of a detecting electrode, having four pairs of connectors, and having an octagon shape; -
FIG. 5 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a detecting electrode via a conductor, having five connectors, and having an octagon shape; -
FIG. 6 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a counter electrode via a conductor, having five connectors, and having a quadrangle shape; -
FIG. 7 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a detecting electrode at a predetermined resistance value, having five connectors, and having an octagon shape; -
FIG. 8 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a reference terminal connected to a connection terminal of a counter electrode via a conductor and a dummy electrode, having six connectors, and having a hexagon shape; -
FIG. 9A is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a detecting electrode, a working electrode, a counter electrode and a reference terminal, but does not have an Hct electrode, having four connectors, and having a regular square shape; - On the other hand,
FIG. 9B is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having a detecting electrode, a working electrode, a counter electrode and a reference terminal, but doe not have an Hct electrode, having four connectors, and having a rectangle shape; -
FIG. 10 is a perspective plan view of the blood sensor and shows the arrangement of electrodes, and the like, the blood sensor having two reference terminals and six connectors, and having a hexagon shape; -
FIG. 11A shows a blood sensor with an attaching guide; -
FIG. 11B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 11A is attached; -
FIG. 11C shows a state where the blood sensor is attached to the attaching part which prevents the blood sensor from being attached at undesirable positions; -
FIG. 11D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 12A shows a blood sensor with an attaching guide; -
FIG. 12B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 12A is attached; -
FIG. 12C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 12D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 13A shows a blood sensor with an attaching guide; -
FIG. 13B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 13A is attached; -
FIG. 13C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 13D shows a state where the blood sensor is attached to the attaching part which prevents the blood sensor from being attached at undesirable positions; -
FIG. 14A shows a blood sensor with an attaching guide; -
FIG. 14B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 14A is attached; -
FIG. 14C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 14D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 15A shows a blood sensor with an attaching guide; -
FIG. 15B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 15A is attached; -
FIG. 15C shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 15D shows a state where the blood sensor is attached to the attaching part, which prevents the blood sensor from being attached at undesirable positions; -
FIG. 16A shows a blood sensor with attaching guides; -
FIG. 16B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 16A is attached; -
FIG. 16C shows a state where the blood sensor is attached to the attaching part and the attaching guides lead the blood sensor to a predetermined attachment position; -
FIG. 17A shows a blood sensor with attaching guides; -
FIG. 17B shows an attaching part of the blood test apparatus to which the blood sensor shown inFIG. 17A is attached, and in which connectors are arranged at unequiangular intervals; -
FIG. 17C shows a state where the blood sensor shown inFIG. 17A is attached to the attaching part shown inFIG. 17B ; -
FIG. 17D shows a state where the blood sensor shown inFIG. 17A is attached to the attaching part shown inFIG. 17B ; -
FIG. 17E shows a state where the blood sensor shown inFIG. 17A is attached to the attaching part shown inFIG. 17B ; -
FIG. 17F shows a state where the blood sensor shown inFIG. 17A is attached to the attaching part shown inFIG. 17B ; -
FIG. 17G shows a state where the blood sensor shown inFIG. 17A is attached to the attaching part shown inFIG. 17B ; -
FIG. 17H shows a state where the blood sensor shown inFIG. 17A is attached to the attaching part shown inFIG. 17B ; -
FIG. 18A is a diagrammatic perspective view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached; -
FIG. 18B is a cross-sectional view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached; -
FIG. 18C is a cross-sectional view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached; -
FIG. 18D is a cross-sectional view of a blood sampling cartridge including a blood sensor and a holder, and an attaching part of the blood test apparatus, to which the blood sampling cartridge is attached; -
FIG. 19A is a diagrammatic perspective view of a blood sampling cartridge including a blood sensor and a holder, and a blood test apparatus to which the blood sampling cartridge is attached, the blood sampling cartridge having electrodes that connects with the electrodes of the blood sensor through wiring; -
FIG. 19B is a diagrammatic perspective view of a blood sampling cartridge including a blood sensor and a holder, and a blood test apparatus to which the blood sampling cartridge is attached, the blood sampling cartridge having electrodes that connect with the electrodes of the blood sensor through wiring; -
FIG. 19C is a cross-sectional view of a blood sampling cartridge with electrodes that connect with the electrodes of the blood sensor through wiring, and an attaching part of the blood test apparatus; -
FIG. 19D is a cross-sectional view showing a state where the blood sampling cartridge with electrodes that connect with the electrodes of the blood sensor through wiring, is attached to the attaching part; -
FIG. 19E is a cross-sectional view showing a state where the blood sampling cartridge with electrodes that connect with the electrodes of the blood sensor through wiring, is attached to the attaching part; -
FIG. 20 is a diagrammatic perspective view of the blood sampling cartridge; -
FIG. 21 is a diagrammatic perspective view showing assembly of the blood sampling cartridge; -
FIG. 22A is a cross-sectional view of the blood sampling cartridge upon puncturing; -
FIG. 22B is a cross-sectional view of the blood sampling cartridge after puncturing is finished; -
FIG. 23 is a plan view that expands the main part of an attaching guide for inserting the blood sampling cartridge into an attaching part; -
FIG. 24 is a cross-sectional view of the attaching part of the blood test apparatus into which the blood sampling cartridge is inserted; -
FIG. 25A is a cross-sectional view showing a state of a lancet before puncturing in a state where the blood sampling cartridge is attached to the blood test apparatus; -
FIG. 25B is a cross-sectional view showing a state of the lancet upon puncturing in a state where the blood sampling cartridge is attached to the blood test apparatus; -
FIG. 25C is a cross-sectional view showing a state of the lancet after puncturing is finished in a state where the blood sampling cartridge is attached to the blood test apparatus; -
FIG. 26 is a cross-sectional view of the blood test apparatus to which the blood sampling cartridge is attached; -
FIG. 27 shows a flow of blood sugar level (glucose) measurement using the blood test apparatus; -
FIG. 28 shows a principle of glucose measurement in blood using the blood test apparatus; -
FIG. 29 is a characteristic diagram of blood sugar level (glucose) measurement; -
FIG. 30 is a block diagram of the blood test apparatus; -
FIG. 31 is a block diagram of the blood test apparatus with a negative pressure apparatus; -
FIG. 32 is a cross-sectional view of the blood test apparatus with a negative pressure apparatus; -
FIG. 33 is a cross-sectional view that expands the main part of the blood test apparatus with a negative pressure apparatus; -
FIG. 34 shows a state of use of the blood test apparatus; -
FIG. 35 is a cross-sectional view of a conventional blood sensor; -
FIG. 36A andFIG. 36B are perspective plan views of a conventional blood sensor; and -
FIG. 37 illustrates the way to use a conventional blood sensor. - The blood sensor of the present invention is a component that is attached to a blood test apparatus and that can be removed or changed. As described later, the blood test apparatus has a plurality of connectors that connect with the blood sensor which is attached at a predetermined position.
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FIG. 1A andFIG. 1B are cross-sectional views ofblood sensor 20 which is an example of the blood sensor.Blood sensor 20 is formed withbase plate 35.Base plate 35 hassubstrate 21,spacer 22 pasted on the upper surface ofsubstrate 21, and cover 23 pasted on the upper surface ofspacer 22. -
Blood storing part 24 is provided inbase plate 35 of blood sensor 20-1 shown inFIG. 1A and opens toward the side that will be placed on the skin (downward in the figure). Storingpart 24 is formed withhole 21 a provided insubstrate 21 andhole 22 a provided inspacer 22.Blood storing part 24 is preferably provided in approximately the center ofbase plate 35. - One end of
supply channel 25 is connected to storingpart 24. The blood stored in storingpart 24 flows intosupply channel 25 by capillary action and is led to detectingsection 27. The other end ofsupply channel 25 is connected toair hole 26. -
Reagent 10 is preferably placed on detectingsection 27. Detectingsection 27, which will be described later, is, for example, placed onsubstrate 21.Reagent 10 is selected as appropriate depending on the type of the blood component to be measured. When the glucose level is measured,reagent 10 is prepared by dropping on detecting section 27 a reagent solution prepared by adding and dissolving PQQ-GDH (0.1 to 5.0 U/sensor), potassium ferricyanide (10 to 200 mM), maltitol (1 to 50 mM) and taurine (20 to 200 mM) to a 0.01 to 2.0 wt % aqueous solution of CMC, and drying the reagent solution. - In the same way as in blood sensor 20-2 shown in
FIG. 1B , hole 23 a may be provided incover 23. Puncturing needle 32 (described later) passes throughhole 23 a. Ifhole 23 a is provided incover 23 in advance, it is not necessary to open a puncturing hole incover 23 using puncturingneedle 32, so that less force is required upon puncturing, and the damage of the needle tip of puncturingneedle 32 is minimized. - [The State where Blood is Brought in the Blood Sensor]
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FIG. 2 shows a state where blood is brought inblood sensor 20. First,blood sensor 20 is brought into contact withskin 7 of the patient (such as finger skin). A puncturing means provided in the blood test apparatus makes a scar onskin 7. The puncturing means is puncturingneedle 32 inFIG. 2 , but the puncturing means is not particularly limited to this and may be a laser, for example. Puncturingneedle 32 provided in the blood test apparatus is propelled in the direction of the arrow. Puncturingneedle 32 breaks throughcover 23 formingupper side 24 a of storing part 24 (when there is nohole 23 a in cover 23) andforms puncturing hole 36. Further, puncturingneedle 32 makes a scar onskin 7.Blood 13 flows out fromskin 7 where a scar is made. The outflowingblood 13fills storing part 24.Blood 13 then flows intosupply channel 27 by capillary action and is led to detectingsection 27. -
Diameter 26 a of air hole 26 (seeFIG. 1A ) is preferably 50 to 500 μm (for example, 50 μm) to prevent blood from flowing out more than necessary fromair hole 26. Further, the area ofair hole 26 in blood sensor 20-1 is preferably smaller than the area of puncturing hole 36 (hole incover 23, formed by puncturingneedle 32; seeFIG. 2 ). By making the area of puncturinghole 36 larger thanair hole 26, most ofblood 13 over-sampled in storingpart 24 flows out from puncturinghole 36. On the other hand,less blood 13 flows out fromair hole 26, and so reagent 10 is less likely to be washed away. Therefore,reagent 10 does not move from detectingsection 27, andblood 13 is examined correctly in detectingsection 27. In the same way, the area ofhole 23 a provided incover 23 in blood sensor 20-2 is preferably larger than that ofair hole 26. - First, the area of the reverse side of cover 23 (the surface pasted to the spacer) corresponding to “the inner surface of
supply channel 25” is preferably subjected to hydrophilicity treatment to makeblood 13 smoothly flow intosupply channel 25 by capillary action. Further, the area of the reverse side ofcover 23 corresponding to “the upper side of storingpart 24” is preferably less hydrophilic than the area of the reverse side ofcover 23 corresponding to the inner surface ofsupply channel 25 to makeblood 13 more smoothly flow intosupply channel 25 at a constant speed. Ifblood 13 flows intosupply channel 25 at a constant speed and reaches detectingsection 27, the melting behavior ofreagent 10 exhibits no variation, and the components ofblood 13 can be measured correctly. - The surface of cover 23 (the reverse side of the surface pasted to the spacer) is preferably subjected to water-repellency treatment to prevent the blood in storing
part 24 from flowing out more than necessary fromair hole 26 or a hole in cover 23 (for example, puncturinghole 36 by puncturingneedle 32 orhole 23 a in the cover). Further, the area of the reverse side ofcover 23 corresponding to “the upper side of storingpart 24” is preferably less water-repellent than the surface ofcover 23 to prevent the blood in storingpart 24 from flowing out, more effectively. By preventing blood from flowing out, it is possible to reduce the amount of sampled blood and alleviate the load on the patient. - In the surface of
substrate 21, which abuts on the skin, at least the periphery ofhole 21 a is preferably water-repellent, and the whole surface may be water-repellent. The term “water-repellency” preferably refers to a state where the surface free energy is less than 43 mN/m. When the surface ofsubstrate 21, which abuts on the skin is water-repellent, when the skin is punctured with puncturingneedle 32 the blood flowing out can be brought to storingpart 24 more easily. - The level of the hydrophilicity or water-repellency is adjusted by performing hydrophilicity treatment or water-repellency treatment. To improve the hydropilicity or water-repellency, hydrophilic material or water-repellent material may be mixed with the material of a member forming
blood sensor 20 or hydrophilic material or water-repellent material may be applied to the surface of the member. By adjusting the amount of the hydrophilic material or water-repellent material to be mixed or applied, the level of hydrophilicity or water-repellency is also adjusted. Further, by dissolving or removing hydrophilic material from hydrophobic material (plastic, for example, polyethylene terephthalate) with the hydrophilic material applied on the surface, the hydrophilicity can be reduced. Still further, the characteristic of the hydrophilic material can be adjusted by radiating UV to the hydrophilic material. -
Blood sensor 20 with its hydrophilicity or water-repellency controlled as described above, is manufactured using, for example, the following method. In advance, water-repellent treatment is applied to the upper surface ofcover 23, and hydrophilic treatment is applied to the lower surface ofcover 23. Further, in advance, the whole of the reverse side of substrate 21 (reverse surface of the surface pasted to the spacer) or the periphery ofhole 21 a, may be subjected to hydrophobic treatment. Next,substrate 21,spacer 22 and cover 23 are pasted (spacer 22 is pasted on the surface ofcover 23, where hydrophilicity treatment is applied). - As described above,
blood sensor 20 hasblood storing part 24 andblood supply channel 25, and the volume of storingpart 24 is one to twenty times, preferably four to fifteen times, and, more preferably, five to seven times as much as the volume ofsupply channel 25. For example, the volume of storingpart 24 in blood sensor 20-1 shown inFIG. 1A may be 0.904 μL, and the volume ofblood supply channel 25 may be 0.144 μL. In this way, by controlling the volume ratio between storingpart 24 andsupply channel 25 adequately, the speed of the blood flowing insupply channel 25 can be controlled to be constant, and the flow rate of the blood flowing insupply channel 25 can be controlled adequately, so that blood does not wash awayreagent 10 and reacts withreagent 10 sufficiently, which realizes a correct test. - Further, by controlling the volume ratio between storing
part 24 andsupply channel 25, it is possible to reduce their volumes. Therefore, the amount of the blood sampled for a test can be reduced, and the load on the patient can be also alleviated. - The thickness of
substrate 21,spacer 22 and cover 23 ofblood sensor 20 and their ratio are important for sampling blood. First, to cause capillary action insupply channel 25, the thickness ofspacer 22 preferably falls within a range of 0.05 to 0.15 mm (preferably 0.1 mm). - Further, in
blood sensor 20, to adjust the volume of storingpart 24 and the volume ofsupply channel 25, it is necessary to adjust the thickness ofspacer 22 and the thickness ofsubstrate 21. The thickness ofsubstrate 21 is preferably the same as the thickness ofspacer 22 or greater and preferably falls within the range where the thickness of substrate 21:the thickness ofspacer 22=1:1 to 5:1 (preferably, 2.5:1). Further, the thickness ofcover 23 is preferably less than the thickness ofsubstrate 21 so that the total thickness ofblood sensor 20 is thinner. Therefore, the thickness of substrate 21:the thickness of spacer 22:the thickness ofcover 23 may be 2.5:1.3:1 as a reference. - [The Plan View that Disassembles the Blood Sensor]
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FIG. 3 is a plan view of disassembled blood sensor 20-1. As described above, blood sensor 20-1 hascover 23 shown inFIG. 3A ,spacer 22 shown inFIG. 3B andsubstrate 21 shown inFIG. 3C . -
FIG. 3C is a plan view ofsubstrate 21. Althoughsubstrate 21 is an octagon, the shape of the substrate is not particularly limited. The material ofsubstrate 21 is preferably resin such as polyethylene terephthalate (PET). The thickness ofsubstrate 21 preferably falls within a range of 0.075 to 0.25 mm (preferably 0.188 mm). - On one surface of substrate 21 (surface that is pasted with spacer 22), electrode
system including electrodes 28 to 31 andconnection terminals 28 a to 31 a connected toelectrodes 28 to 31 of the electrode system, respectively, are formed in an integrated manner. Electrodesystem including electrodes 28 to 31 andconnection terminals 28 a to 31 a are formed by forming a conductive layer using the sputtering method or the vapor deposition method, using gold, platinum, palladium as material and applying laser machining to this conductive layer.Hole 21 a is provided in approximately the center ofsubstrate 21, and its diameter may be approximately 2.0 mm. -
FIG. 3B is a plan view ofspacer 22. The thickness ofspacer 22 may fall in a range of 0.05 to 0.15 mm (preferably 0.1 mm).Spacer 22 is preferably a polygon such as an approximate cross shape, because connector 47 (not shown) of the blood test apparatus can be arranged in a cross-shaped dent easily.Hole 22 a is provided in approximately the center ofspacer 22, at theposition matching hole 21 a provided insubstrate 21. The diameter ofhole 22 a may be made the same (approximately 2.0 mm) as the diameter ofhole 21 a.Slit 22 e is formed in one convex portion of thecross-shaped spacer 22 fromhole 22 a. Theslit 22 e matchesblood supply channel 25. By setting the width of the groove ofslit 22 e 0.6 mm and setting the length in the flow channel direction 2.4 mm, the cavity ofsupply channel 25 may be set approximately 0.144 μL. In this way, test can be performed with a small amount of blood, so that the load on the patient becomes small, and the patient does not feel fear. The material ofspacer 22 may be resin such as polyethylene terephthalate (PET). -
FIG. 3A is a plan view ofcover 23.Cover 23 has an approximate cross shape,air hole 26 is provided in cross-shaped firstconvex portion 23 d so as to match the tip part ofsupply channel 25. Preferably, the diameter ofair hole 26 is approximately 50 μm. - The material of
cover 23 is plastic, and preferably polyethylene terephthalate. The thickness ofcover 23 may fall in a range of 0.05 to 0.25 mm (preferably 0.075 mm). - As described above, in
blood sensor 20, an electrode system including a plurality of electrodes, connection terminals deriving from each electrode of the electrode system and a reference terminal are arranged.Blood sensor 20 has (1) a reference terminal connected with one of the connection terminals at a predetermined resistance value or (2) two or more reference terminals connected with each other at a predetermined resistance value (preferably 0). - Further, an electrode system arranged in the blood sensor includes at least a “working electrode” and a “counter electrode.” The “working electrode” refers to an electrode for measuring blood components, and the “counter electrode” refers to a counterpart electrode of the working electrode. Further, the electrode system arranged in the blood sensor preferably includes a detecting electrode. The “detecting electrode” refers to an electrode for detecting whether blood is supplied to the detecting section. Still further, the electrode system may include an Hct electrode, which refers to an electrode for measuring the hematocrit level of blood.
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Blood sensor 20 is preferably a round or a polygon, but the shape is not particularly limited. Ifblood sensor 20 is a quadrangle or a hexagon, it is possible to improve the yield rate in manufacturing. Further, a hexagon allows a large inscribed circle and is therefore more preferable. That is, if the inscribed circle is the same, the area of the hexagon is smaller than the area of the quadrangle, because of that the hexagon is advantageous. -
FIG. 4 toFIG. 9 are perspective plan views ofblood sensor 20 and show examples of the arrangement of electrodes in above-described blood sensor 20 (1) that has a reference terminal connected with one of the plurality of connection terminals at a predetermined resistance value. On the other hand,FIG. 10 is a perspective plan view showing an example of the arrangement of electrodes in above-described blood sensor 20 (2) that has two or more reference terminals connected with each other at a predetermined resistance value. - Although
blood sensor 20 a shown inFIG. 4 is an octagon,blood sensor 20 a may have other shapes.Electrodes 28 to 31 of the electrode system are formed from storingpart 24 towardair hole 26. From storingpart 24,electrode 31 as an Hct electrode,electrode 30 as a counter electrode,electrode 28 as a working electrode, (electrode 30 as a counter electrode) andelectrode 30 as a detecting electrode, are arranged in that order. - Detecting
section 27 is formed onsubstrate 21,reagent 10 is placed in contact with part of detectingsection 27.Reagent 10 is preferably placed in contact withelectrode 28 which functions as a working electrode, andelectrode 30 which functions as a counter electrode. On the other hand,reagent 10 is preferably not placed in contact withelectrode 31 which functions as an Hct electrode. - From electrode
system including electrodes 28 to 31, correspondingconnection terminals Connection terminals 28 a to 31 a each have contact part that contacts with a connector pair including two connectors. That is,connection terminal 28 a has a contact part formed with 28 c and 28 d,connection terminal 29 a has a contact part formed with 29 c and 29 d,connection terminal 30 a has a contact part formed with 30 c and 30 d, andconnection terminal 31 a has a contact part formed with 31 c and 31 d. The contact parts are arranged along the outer periphery ofsubstrate 21. - Only 29 c of contact part formed with 29 c and 29 d is formed on insulating
member 34. Therefore, 29 c is electrically insulated from 29 d, (that is,connection terminals 29 a is electrically insulated from 29 c), and the resistance between 29 c and 29 d becomes infinite, while the resistance between 28 c and 28 d, 30 c and 30 d, and 31 c and 31 d becomes zero. To electrically insulate 29 c from 29 d, 29 c may be arranged on insulatingmember 34 provided onconnection terminal 29 a, a slit may be provided around 29 c, or 29 c may be insulated from 29 d by cutting out part includingcontact part 29 c fromconnection terminal 29 a. - Further, it is also possible to insulate one of 28 c and 28 d, 30 c and 30 d, and 31 c and 31 d instead of insulating 29 c and 29 d. That is, one arbitrary connector pair is insulated each other.
- 29 c insulated from 29 d (that is,
connection terminal 29 a) can be used as a reference terminal. When the electrical resistance between the contact parts in pairs is measured, the resistance in one pair is infinite, so that it is possible to specifyreference terminal 29 c. Based on the specified reference terminal, the connection terminals can be identified, for example, clockwise asconnection terminal 29 a,connection terminal 30 a,connection terminal 31 a andconnection terminal 28 a, and the functions of each electrode of electrode system connected to the connection terminals can be specified. - If
blood sensor 20 a having a reference terminal is attached to an attaching part (described later) of the blood test apparatus, it is not necessary to consider the relationship between the connectors of the blood test apparatus and the contact parts of the blood sensor, and so it is not necessary to adjust the angle of attachment with eyes, so that attaching a blood sensor becomes simple. - Although
blood sensor 20 b shown inFIG. 5 is an octagon,blood sensor 20 b may have other shapes. In the same way asblood sensor 20 a,blood sensor 20 b has electrodesystem including electrodes 28 to 31 andconnection terminals 28 a to 31 a deriving from each electrode of the electrode system.Connection terminals 28 a to 31 ahave contact parts 28 g to 31 g, respectively, and, further,connection terminal 29 a hasreference contact part 29 h in addition to contactpart connection terminal 29 a, but may be provided in any one ofconnection terminals 28 a to 31 a. Contactparts 28 g to 31 g andreference contact part 29 h are preferably arranged near the outer periphery at equiangular intervals. For example, a regular pentagon may be formed withparts blood sensor 20 b may be made the same asblood sensor 20 a except that the mode of the reference contact part is different. -
Reference contact part 29 h can be specified by measuring the electrical resistance betweenreference contact part 29 h and each ofcontact parts 28 g to 31 g. That is, the electrical resistance between one of the contact parts of the connection terminals andreference contact part 29 h becomes zero, and soreference contact part 29 h can be specified. Using the specified reference contact part as a reference (29 h in this example), the connection terminals can be identified clockwise asconnection terminals -
Blood sensor 20 b hascontact parts 28 g to 31 g andreference contact part 29 h, and so the blood test apparatus (described later), to whichblood sensor 20 b is attached, has five connectors matching the contact parts and the reference contact part. Further, the blood test apparatus has five terminals matching the connectors. - In this way, when
blood sensor 20 b having a reference terminal is attached to an attaching part (described later) of the blood test apparatus, it is not necessary to consider the relationship between the connectors of the blood test apparatus and the contact parts of the blood sensor, and so it is not necessary to adjust the angle of attachment with eyes, so that attaching a blood sensor becomes simple. - Although
blood sensor 20 b′ shown inFIG. 6 is a quadrangle,blood sensor 20 b′ may have other shapes. In the same way asblood sensor 20 b,blood sensor 20 b′ has electrodesystem including electrodes 28 to 31 andconnection terminals 28 a to 31 a deriving from each electrode of the electrode system.Connection terminals 28 a to 31 ahave contact parts 28 g to 31 g, respectively, and, further,connection terminal 30 acorresponding counter electrode 30 hasreference contact part 30 h in addition to contactpart blood sensor 20 b. - Although
blood sensor 20 c shown inFIG. 7 is an octagon,blood sensor 20 c may have other shapes. In the same way asblood sensor 20 a,blood sensor 20 c has electrodesystem including electrodes 28 to 31 andconnection terminals 28 a to 31 a deriving from each electrode of the electrode system.Connection terminals 28 a to 31 ahave contact parts 28 g to 31 g, respectively. Further,connection terminal 29 a hasreference contact part 29 h in addition to contactpart Reference contact part 29 h and contactpart 29 g are connected at a predetermined resistance value. A reference contact part does not have to be provided inconnection terminal 29 a but may be provided in any one ofconnection terminals 28 a to 31 a. In this way,blood sensor 20 c may be made the same asblood sensor 20 a except that the mode of the reference contact part is different. - Contact
parts 28 g to 31 g andreference contact part 29 h are preferably arranged near the outer periphery at equiangular intervals. For example, a regular pentagon may be formed withcontact parts reference contact part 29 h. Therefore, in the same way as the case ofblood sensor 20 b, the blood test apparatus to whichblood sensor 20 c is attached, has five connectors and five terminals. - Contact
part 29 g andreference contact part 29 h are connected with pattern (used as an example of predetermined resistance) 38 which is patterned by laser machining inconnection terminal 29 a. By changing the width ofpattern 38, it is possible to adjust the resistance value betweencontact part 29 g andreference contact part 29 h to a predetermined value. Therefore,reference contact part 29 h can be specified by measuring the electrical resistance betweenreference contact part 29 h and each ofcontact parts 28 g to 31 g. That is, the electrical resistance between one of the contact parts of the connection terminals andreference contact part 29 h becomes a predetermined value, and so the reference contact part can be specified. Based on the specified reference contact part (29 h in this example), the connection terminals can be identified clockwise asconnection terminals -
Reference contact part 29 h can be also used to determine the type ofblood sensor 20 c other than used as a reference terminal. Examples of determining the type of the blood sensor include setting the blood test apparatus so thatcalibration curve 1 is used when the resistance value ofpattern 38 is 200 to 1000 ohms,calibration curve 2 is used when the resistance value is 1000 to 2000 ohms, andcalibration curve 3 is used when the resistance value is 2000 to 3000 ohms, determining the type of the blood sensor from the resistance value, and automatically selecting the calibration curve to be applied. Further, it is also possible to determine the product specifications of shipped blood sensors, for example, the specification for company A and the specification for company B, depending on the resistance values ofpattern 38. Further, by changing an oscillation frequency according to an inductance value adjusted bypattern 38 so that configuringblood sensor 20 c has various information, the blood sensor can be determined using the information. - When
blood sensor 20 c havingreference contact part 29 h, which serves as a reference terminal, is attached to an attaching part (described later) of the blood test apparatus, it is not necessary to consider the relationship between the connectors of the blood test apparatus and the contact parts of the blood sensor, and so it is not necessary to adjust the angle of attachment with eyes, so that attaching a blood sensor becomes simple. - Although
blood sensor 20 d shown inFIG. 8 is a hexagon,blood sensor 20 d may have other shapes.Blood sensor 20 d has electrodesystem including electrodes 28 to 31 andconnection terminals 28 a to 31 a deriving from each electrode of the electrode system.Connection terminals 28 a to 31 ahave contact parts 28 g to 31 g, respectively. Further,connection terminal 30 a hasreference contact part 30 h used as a reference terminal in addition to contactpart 30 g. The reference contact part does not have to be provided inconnection terminal 30 a but may be provided in any one ofconnection terminals 28 a to 31 a. - Further,
blood sensor 20 d also hasdummy electrode 33. The dummy electrode is provided to maintain mechanical balance (balance of the contact positions). Contactpart 33 g is arranged ondummy electrode 33. Therefore, the blood test apparatus to whichblood sensor 20 d is attached, has six connectors. - Contact
parts 28 g to 31 g andreference contact part 30 h are preferably arranged near the outer periphery ofblood sensor 20 d at equiangular intervals. For example, a regular hexagon may be formed withparts 28 g to 31 g, 30 h and 33 g. - The
reference contact part 30 h can be specified by measuring the electrical resistance betweenreference contact part 30 h, and each ofcontact parts 28 g to 31 g and contactpart 33 g ofdummy electrode 33. That is, the electrical resistance between one of the contact parts andreference contact part 30 h becomes zero, and soreference contact part 30 h can be specified. Using the specified reference contact part as a reference (30 h in this example), the connection terminals can be identified clockwise asconnection terminal 30 a,dummy electrode 33,connection terminal 31 a of an Hct electrode,connection terminal 28 a of a working electrode andconnection terminal 29 a of a detecting electrode, and the arrangement of the connection terminals can be specified. - Although
blood sensor 20 e shown inFIG. 9A is a regular square andblood sensor 20 e′ shown inFIG. 9B is a rectangle,blood sensor 20 e andblood sensor 20 e′ may have other shapes.Blood sensors electrode 28 for a working electrode,electrode 29 for a detecting electrode, andelectrode 30 for a counter electrode, and are different from above-describedblood sensors 20 a to 20 d in thatblood sensors electrode 31, which is an Hct electrode. - Further,
blood sensors connection terminals 28 a to 30 a deriving fromelectrodes 28 to 30, respectively, and contactparts 28 g to 30 g are arranged inconnection terminals 28 a to 30 a, respectively. Further,connection terminal 29 a hasreference contact part 29 h in addition to contactpart blood sensor 20 e is attached.Parts 28 g to 30 g and 29 h are preferably arranged near the outer periphery ofblood sensor contact parts 28 g to 30 g andreference contact part 29 h. The reference contact part does not have to be provided inconnection terminal 29 a but may be provided in any one ofconnection terminals 28 a to 30 a. - The
reference contact part 29 h can be specified by measuring the electrical resistance betweenreference contact part 29 h and each ofcontact parts 28 g to 30 g. That is, the electrical resistance between one of the contact parts andreference contact part 29 h becomes substantially zero, and soreference contact part 29 h can be specified. Using the specified reference contact part as a reference (29 h in this example), the connection terminals can be identified clockwise asconnection terminals - Although
blood sensor 20 f shown inFIG. 10 is a hexagon,blood sensor 20 f may have other shapes.Blood sensor 20 f has electrodesystem including electrodes 28 to 31 andconnection terminals 28 a to 31 a deriving from each electrode of the electrode system. Contactparts 28 g to 31 g are arranged inconnection terminals 28 a to 31 a, respectively. Further,blood sensor 20 f haselectrode 33, and tworeference contact parts electrode 33. Contactparts 28 g to 31 g andreference contact parts blood sensor 20 f is attached. -
Reference contact parts connection terminals - [The Blood Sensor with an Attaching Guide]
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Blood sensor 20 preferably has an attaching guide. The attaching guide is a component for attachingblood sensor 20 at a predetermined position of the blood test apparatus. The predetermined position is a position where a plurality of connectors of the blood test apparatus are connected with contact parts of the connection terminals of the blood sensor and a contact part which serves as a reference terminal. Further, at the predetermined position, the plurality of connectors do not contact with the boundaries between the electrodes of the blood sensor. - The connectors of the blood test apparatus preferably contact with the periphery of the axis of the blood sensor attached at the predetermined position. The axis of the blood sensor is near the axis of the rotation of the blood sensor when the blood sensor is inserted to the attaching part of the blood test apparatus. Further, the axis of the blood sensor may be near the center of the part where the blood sensor unit (which is, for example, a blood sensor or a cartridge including a blood sensor) and the attaching part of the blood test apparatus engage with each other. The axis of the blood sensor is usually inside storing
part 24 on the surface of the substrate of the blood sensor. - The attaching guide preferably adjusts as appropriate the rotation angle with respect to the axis of attached
blood sensor 20 to the blood test apparatus. That is, the attaching guide may be (1) a guide that adjusts the rotation angle with respect to the axis of theblood sensor 20 to angles other than an undesirable angle, that is, the guide preventsblood sensor 20 from being led to certain undesirable positions, or (2) a guide that adjusts the rotation angle with respect to the axis to a predetermined angle, that is, leadsblood sensor 20 to a predetermined position selectively. -
FIG. 11 toFIG. 15 show examples of combination ofblood sensor 20 integrated with holder 80 having attachingguide 81 that prevents a blood sensor from being led to certain undesirable positions and attaching part 90 of the blood test apparatus to whichblood sensor 20 is attached. In this case, a “certain undesirable position” refers to a position where the connectors of the blood test apparatus are placed at the boundaries between the electrodes (such as connection terminals and a dummy electrode) formed inblood sensor 20, because, if the connectors of the blood test apparatus contact with the boundaries between the electrodes ofblood sensor 20, measurement is not possible. - On the other hand,
FIG. 16 andFIG. 17 show examples of combination ofblood sensor 20 with holder 80 that leadsblood sensor 20 to a predetermined position selectively, and attaching part 90 of the blood test apparatus, to whichblood sensor 20 is attached. -
FIG. 11A showsblood sensor 20 d with holder 80-1.Blood sensor 20 d is the same as the blood sensor shown inFIG. 8 , is a hexagon, and has fourconnection terminals 28 a to 31 a deriving from the four electrodes of the electrode system anddummy electrode 33. Contactparts 28 g to 31 g are arranged inconnection terminals 28 a to 31 a, respectively, contactpart 33 g is arranged indummy electrode 33, and, further,reference contact part 30 h, which serves as a reference terminal, is arranged inconnection terminal 30 a On the other hand, holder 80-1 is fixed and arranged so as to surroundblood sensor 20 d and has one attachingguide 81 in its inner periphery. -
FIG. 11B shows attaching part 90-1 of the blood test apparatus to whichblood sensor 20 d with holder 80-1 is attached. Attaching part 90-1 has six connectors 47-1 to 47-6, and attaching part 90-1 has six attaching guides 91-1 to 91-6 on the outer surface. Each ofconnectors 47 and attaching guides 91 are preferably arranged at equiangular intervals on the circle line. - It is also possible to arrange six attaching
guides 81 on the inner surface of holder 80-1 and one attaching guide 91 on the outer surface of attaching part 90-1. -
FIG. 11C andFIG. 11D show a state whereblood sensor 20 d with holder 80-1 is attached to attaching part 90-1 of the blood test apparatus. Four connectors (47-2 or 47-3, 47-4, 47-5 and 47-6 in the figure) out of six connectors of attaching part 90-1 contact withcontact parts 28 g to 31 g ofconnection terminals 28 a to 31 a one by one, one connector (47-3 or 47-2 in the figure) contacts withreference contact part 30 h provided inconnection terminal 30 a, and the remaining one connector (47-1 in the figure) contacts withcontact part 33 g formed indummy electrode 33. As shown inFIG. 11C andFIG. 11D , attachingguide 81 on the inner surface of holder 80-1 and attaching guides 91 on the outer surface of attaching part 90-1 are defined by each other and preventsconnectors 47 of the attaching part from being arranged on the boundaries between the connection terminals ofblood sensor 20 d. - As described above, it is possible to specify
reference terminal 30 h and specify the connection terminals based onreference terminal 30 h. -
FIG. 12A showsblood sensor 20 d with holder 80-2. Holder 80-2 is the same as holder 80-1 inFIG. 11A in that holder 80-2 is arranged so as to surroundblood sensor 20 d and has one attachingguide 81 in its inner periphery, but holder 80-2 is different from holder 80-1 in the positional relationship between attachingguide 81 andblood sensor 20 d. Further, attaching part 90-2 shown inFIG. 12B is different from attaching part 90-1 shown inFIG. 11B in the positions of attaching guides 91. Each ofconnectors 47 and attaching guides 91 of attaching part 90-2 are preferably arranged at equiangular intervals on the circle. - When
blood sensor 20 d with holder 80-2 is attached to attaching part 90-2 shown inFIG. 12B , as shown inFIG. 12C andFIG. 12D , attachingguide 81 of holder 80-2 and attaching guides 91 of attaching part 90-2 are defined by each other and preventsconnectors 47 of attaching part 90-2 from being arranged on the boundaries between the connection terminals ofblood sensor 20 d. -
FIG. 13A showsblood sensor 20 b′ with holder 80-3.Blood sensor 20 b′ is the same as the blood sensor shown inFIG. 6 , is a quadrangle, and has fourconnection terminals 28 a to 31 a deriving from fourelectrodes 28 to 31 of the electrode system. Contactparts 28 g to 31 g are arranged inconnection terminals 28 a to 31 a, and further,reference contact part 30 h, which serves as a reference terminal, is arranged inconnection terminal 30 a. In addition, holder 80-3 has one attachingguide 81 in its inner periphery. -
FIG. 13B shows attaching part 90-3 of the blood test apparatus to whichblood sensor 20 b with holder 80-3 is attached. Attaching part 90-3 shown inFIG. 13B has five connectors 47-1 to 47-5 and five attaching guides 91-1 to 91-5 on the outer surface of attaching part 90-3. Each ofconnectors 47 and attaching guides 91 of attaching part 90-3 are preferably arranged at equiangular intervals on the circle line. - It is also possible to form five attaching
guides 81 on the inner surface of holder 80-3 and one attaching guide 91 on the outer surface of attaching part 90-3. -
FIG. 13C andFIG. 13D show a state whereblood sensor 20 b′ with holder 80-3 is attached to attaching part 90-3 of the blood test apparatus. Four connectors (47-1 or 47-2, 47-3, 47-4 and 47-5 in the figure) out of fiveconnectors 47 of attaching part 90-3 contact withcontact parts 28 g to 31 g ofconnection terminals 28 a to 31 a, respectively, and the remaining one connector (47-2 or 47-1 in the figure) contacts withreference contact part 30 h. As shown inFIG. 13C andFIG. 13D ,projection 81 on the inner surface of holder 80-3 and attaching guides 91 on the outer surface of attaching part 90-3 are defined by each other and preventsconnectors 47 of attaching part 90-3 from contacting with the boundaries between the connection terminals of the blood sensor. -
FIG. 14A showsblood sensor 20 f with holder 80-4.Blood sensor 20 f is the same as the blood sensor shown inFIG. 10 , is a hexagon, and has fourconnection terminals 28 a to 31 a deriving from the four electrodes of the electrode system andelectrode 33. Contactparts 28 g to 31 g are arranged inconnection terminals 28 a to 31 a, respectively, and, further, contactpart 33 h, which serves as a reference terminal, is arranged inelectrode 33. In addition holder 80-4 has one attachingguide 81 in its inner periphery. -
FIG. 14B shows attaching part 90-4 of the blood test apparatus to whichblood sensor 20 f with holder 80-4 is attached. Attaching part 90-4 shown inFIG. 14B has six connectors 47-1 to 47-6, and attaching part 90-4 has six attaching guides 91-1 to 91-6 on the outer surface of the attaching part. Each ofconnectors 47 and a projecting part of attaching part 90-4 are preferably arranged at equiangular intervals on the circle line. - It is also possible to form six attaching
guides 81 on the inner surface of holder 80-4 and one attaching guide 91 on the outer surface of attaching part 90-4. -
FIG. 14C andFIG. 14D show a state whereblood sensor 20 f with holder 80-4 is attached to attaching part 90-4 of the blood test apparatus. Four connectors (47-3 to 47-6) out of sixconnectors 47 of attaching part 90-4 contact withcontact parts 28 g to 31 g ofconnection terminals 28 a to 31 a, respectively, and the remaining two connectors (47-1 and 47-2) contact with tworeference contact parts - As shown in
FIG. 14C andFIG. 14D ,projection 81 on the inner surface of holder 80-4 and attaching guides 91 on the outer surface of attaching part 90-4 are defined by each other and preventconnectors 47 from contacting with the boundaries between the connection terminals ofblood sensor 20 f. - The resistance between two
reference terminals -
FIG. 15A showsblood sensor 20 e with holder 80-5.Blood sensor 20 e is the same as the blood sensor shown inFIG. 9A , is a quadrangle, and hasconnection terminals 28 a to 30 a deriving from threeelectrodes 28 to 30 of the electrode system. Contactparts 28 g to 30 g are arranged inconnection terminals 28 a to 30 a, respectively, and, further,reference contact part 29 h which serves as a reference terminal, is arranged inconnection terminal 29 a. On the other hand, holder 80-5 is fixed and arranged so as to surroundblood sensor 20 e and has one attachingguide 81 in its inner periphery. -
FIG. 15B shows attaching part 90-5 of the blood test apparatus to whichblood sensor 20 e with holder 80-5 is attached. Attaching part 90-5 has four connectors 47-1 to 47-4 and four attaching guides 91-1 to 91-4 on the outer surface. Each ofconnectors 47 and attaching guides 91 of attaching part 90-5 are preferably arranged at equiangular intervals on the circle line. -
FIG. 15C andFIG. 15D show a state whereblood sensor 20 e with holder 80-5 is attached to attaching part 90-5 of the blood test apparatus. Three connectors (47-1, 47-2 and 47-3 or 47-4) out of fourconnectors 47 of attaching part 90-5 contact withcontact parts 28 g to 30 g ofconnection terminals 28 a to 30 a, respectively, and the remaining one connector (47-4 or 47-3) contacts withreference contact part 29 h. - As shown in
FIG. 15C andFIG. 15D , attachingguide 81 on the inner surface of holder 80-5 and attaching guides 91 on the outer surface of attaching part 90-5 are defined by each other, so that it is possible to prevent connectors of attaching part 90-5 from contacting with the boundaries between the connection terminals ofblood sensor 20 f. -
FIG. 16A showsblood sensor 20 d with holder 80-6.Blood sensor 20 d is the same as the blood sensor shown inFIG. 8 , is a hexagon, and has fourconnection terminals 28 a to 31 a deriving from fourelectrodes 28 to 31 of the electrode system anddummy electrode 33. Contactparts 28 g to 31 g are arranged inconnection terminals 28 a to 31 a, respectively, contactpart 33 g is arranged indummy electrode 33, and, further,reference contact part 33 h, which serves as a reference terminal, is arranged inconnection terminal 30 a. In addition, holder 80-6 has six attaching guides 81-1 to 81-6 in its inner periphery. Attaching guides 81 are arranged at equiangular intervals and have the same shape. -
FIG. 16B shows attaching part 90-6 of the blood test apparatus to whichblood sensor 20 d with holder 80-6 is attached. Attaching part 90-6 shown inFIG. 16B has six connectors 47-1 to 47-6, and attaching part 90-6 has six attaching guides 91-1 to 91-6 on the outer surface of the attaching part. Attaching guides 91 of attaching part 90-6 are all arranged at equiangular intervals and have the same shape. -
FIG. 16C shows a state whereblood sensor 20 d with holder 80-6 is attached to attaching part 90-6 of the blood test apparatus. Attaching guides 81 on the inner surface of holder 80-6 and attaching guides 91 on the outer surface of attaching part 90-6 are engaged and fixed, and therebyblood sensor 20 d is attached to attaching part 90-6. Attaching guides 81 and attaching guides 91 are arranged at equiangular intervals and have the same shape, so that attachingguide 81 and attaching guide 91 can be engaged with each other at six positions (seeFIG. 17C toFIG. 17H ). Upon attachment, four connectors (47-1 or 47-2, 47-3, 47-4 and 47-5) out of sixconnectors 47 of attaching part 90-6 contact withcontact parts 28 g to 31 g ofconnection terminals 28 a to 31 a, one connector (47-2 or 47-1) contacts withreference contact part 30 h, and the remaining one connector (47-6) contacts withcontact part 33 g ofdummy electrode 33. - As shown in
FIG. 16 , compared to a case where a holder that prevents the blood sensor from being arranged at undesirable parts (parts that contact with the boundaries between the connection terminals) as shown inFIG. 10 toFIG. 15 , use of a holder that attachesblood sensor 20 at a predetermined position selectively can provide the following advantages. - (1) Even if
connectors 47 of attaching part 90 of the blood test apparatus are not arranged on the same circle, it is possible to bring the connectors into contact with connection terminals and reference terminal. - (2) Even if
connectors 47 of attaching part 90 of the blood test apparatus are not arranged at equiangular intervals, it is possible to bring the connectors into contact with connection terminals and reference terminal. -
FIG. 17 shows (six types of) states whereblood sensor 20 d (FIG. 17A : the same asFIG. 16A ) is attached to attaching part 90-7 (FIG. 17B ) with connectors 47-1 to 47-6 arranged not at equiangular intervals but at unequiangular intervals (FIG. 17C toFIG. 17H ). Even if the blood sensor is attached in any of the states, connectors 47-1 to 47-6 of attaching part 90-7 contact with predetermined parts inblood sensor 20 d. - As described above, a plurality of connectors of the blood test apparatus may contact and connect with the connection terminals and reference terminal of the blood sensor directly, or may connect through wiring. For example, as described later, the blood sampling cartridge may be configured with the blood sensor and the holder in an integrated manner and wirings from the connection terminals and reference terminal of the blood sensor may be installed in the holder. The connectors of the blood test apparatus may be connected with the connection terminals and reference terminal of the blood sensor by contacting with the above-described wirings.
-
Blood sensor 20 may be configured integrated with the holder, which is part of the blood sampling cartridge. The holder of the blood sampling cartridge may be provided with a function of holder 80 described above. -
FIG. 18A is a diagrammatic perspective view showingblood sampling cartridge 61 includingintegrated blood sensor 20 andholder 60, and attachingpart 41 a (with connectors 47) of the blood test apparatus to whichblood sampling cartridge 61 is attached. As shown inFIG. 18A ,holder 60 preferably includes projectingpart 60 a that abuts on the punctured part in addition toblood sensor 20. -
FIG. 18B showsholder 60 divided intofirst holder 60 b andsecond holder 60 c (with projectingpart 60 a) andblood sampling cartridge 61 includingblood sensor 20 sandwiched betweenfirst holder 60 b andsecond holder 60 c.First holder 60 b,second holder 60 c andblood sensor 20 may be separable from each other.Blood sampling cartridge 61 is attached to attachingpart 41 a (with connectors 47) of the blood test apparatus. -
FIG. 18C showsblood sampling cartridge 61 includingholder 60 with projectingpart 60 a andblood sensor 20 attached toholder 60.Holder 60 andblood sensor 20 may be separable.Blood sampling cartridge 61 is attached to attachingpart 41 a (with connectors 47) of the blood test apparatus. Ifholder 60 andblood sensor 20 are separable, the blood sensor can be changed singly, but the steps of manufacturing process may increase.FIG. 18D showsblood sampling cartridge 61 includingholder 60 with projectingpart 60 a andblood sensor 20 which is configured integrated withholder 60 and which cannot be separated.Blood sampling cartridge 61 is attached to attachingpart 41 a (with connectors 47) of the blood test apparatus. -
FIG. 19A showsblood sampling cartridge 61 havingholder 60 with projectingpart 60 a andblood sensor 20 configured integrated withholder 60. Further,blood sampling cartridge 61 hasterminals 63 connected with terminals (such as connection terminals) ofblood sensor 20 throughwiring 62. Further,holder 60 is provided withconcave portion 60 d for controlling the attachment position. On the other hand, attachingpart 41 a of the blood test apparatus to whichblood sampling cartridge 61 is attached, hasconnector 47 andconvex portion 41 i for controlling the attachment position.Connector 47 is urged by an elastic body such as spring and can be forced into attachingpart 41 a (seeFIG. 19C toFIG. 19E ).Convex portion 41 i andconcave portion 60 d are engaged, so thatconnector 47 can contact withterminal 63. -
Blood sampling cartridge 61 and attachingpart 41 a shown inFIG. 19B are the same as the blood sampling cartridge and attaching part shown inFIG. 19A except that (1)connector 47 andconvex portion 41 i in attachingpart 41 a are not on the same circle and (2) terminal 63 arranged inholder 60 ofblood sampling cartridge 61 andconcave portion 60 d are not on the same circle. -
FIG. 19C is a cross-sectional view ofblood sampling cartridge 61 including:holder 60;blood sensor 20 configured integrated withholder 60; wiring 62 from the connection terminals ofblood sensor 20 provided insideholder 60; and terminal 63 which is connected withwiring 62 and exposed.Connector 47 of attachingpart 41 a is connected to terminal 63 which is connected with the electrode ofblood sensor 20 throughwiring 62.Connector 47 of attachingpart 41 a is urged toward the attaching part side (blood sensor side).Connectors 47 may be urged byelastic body 41 j (such as spring) arranged in attachingpart 41 a. -
FIG. 19D shows a state whereblood sampling cartridge 61 is attached to attachingpart 41 a of the blood test apparatus.Concave portion 60 d ofblood sampling cartridge 61 andconvex portion 41 i of attachingpart 41 a are engaged, so that blood sampling cartridge is inserted to an appropriate depth andconnector 47 can contact withholder terminal 63. On the other hand, as shown inFIG. 19E , ifconcave portion 60 d andconvex portion 41 i are not engaged,connector 47 cannot contact withholder terminal 63. -
FIG. 20 is a diagrammatic perspective view showing an example of a blood sampling cartridge includingintegrated blood sensor 20, a puncturing means (including a lancet and blood collection needle) and a holder. Inblood sampling cartridge 42, the height of cross-shapedconvex portion 43 c formed on the oneend 43 a side (blood sensor 20 side) ofholder 43 is higher than the height of cross-shapedconvex portion 43 d formed on theother end 43 b side ofholder 43. That is,holder 43 is thinner atconvex portion 43 d side than at theconvex portion 43 c side. When the front part of the holder of the blood sampling cartridge with respect to the insertion direction is thinner than the rear part as described above,blood sampling cartridge 42 can be inserted into the attaching part of the blood test apparatus in a simple manner. Further, tip end 43 g (the 43 b side) ofconvex portion 43 d at theother end 43 b side projects with a sharp angle, and functions as an attaching guide (described above) to the attaching part of the blood test apparatus. - The whole of
blood sampling cartridge 42 can be attached to and removed from the attaching part, and so puncturingneedle 32 andblood sensor 20 can be attached to and removed from the attaching part together. Therefore,blood sensor 20 and puncturingneedle 32 can be attached and changed in a simple manner. -
FIG. 21 is a diagrammatic perspective view of assembly of an example of the blood sampling cartridge.Blood sampling cartridge 42 has: cylinder-shapedholder 43;blood sensor 20 that is attached to oneend 43 a ofholder 43;lancet 45 that can slide insideholder 43 freely; andneedle 32 that is attached to theother end 45 b oflancet 45.Connector 47 is preferably in the blood test apparatus. For example, eight connectors (four pairs of connectors) in the case ofblood sensor 20 a, five connectors in the case ofblood sensor blood sensor blood sensor 20 e, are arranged in the blood test apparatus. -
Blood sensor 20 is attached to oneend 43 a ofholder 43. The outer surface ofholder 43 inFIG. 21 has a cross shape, andconnector 47 formed with conductive metal (in the blood test apparatus) is led between cross-shapedconvex portion 43 c. Therefore, four connectors are led toblood sampling cartridge 42. - The other end of
holder 43 has anotherconvex portions 43 d formed integrated withconvex portion 43 c, andconvex portion 43 d hashole 43 e. -
Lancet 45 is inserted intoholder 43.Guides 45 c for preventing reuse, are provided 180 degrees apart from each other inlancet 45. Further, guides 45 d for improving linear mobility are provided betweenguides 45 c 180 degrees apart from each other inlancet 45.Guide 45 d is provided so as to slide inhole 43 e.Guide 45 c and guide 45 d are formed integrated withlancet 45.Convex portion 45 e is provided near oneend 45 a oflancet 45, andgrip part 45 f is provided betweenconvex portion 45 e and oneend 45 a. -
FIG. 22A is a cross-sectional view ofblood sampling cartridge 42 upon puncturing, andFIG. 22B is a cross-sectional view ofblood sampling cartridge 42 after puncturing is finished. As shown inFIG. 22A , upon puncturing, puncturingneedle 32 projects fromblood sensor 20 and stays. At this time,convex portion 45 e oflancet 45 is latched atlatch part 43 f provided at theother end 43 b ofholder 43. Therefore, puncturingneedle 32 does not further project from the blood sensor. As shown inFIG. 22B , when puncturing is finished, puncturingneedle 32 is accommodated inholder 43 and stays. The base ofguide 45 c oflancet 45 is latched atlatch part 43 f provided at theother end 43 b ofholder 43. Therefore,lancet 45 does not fall off fromholder 43. - In the state shown in
FIG. 22B ,blood sampling cartridge 42 is removed from attachingpart 41 a of the blood test apparatus. In the state shown inFIG. 22B , even iflancet 45 is pushed in the direction ofarrow 55 by error, guide 45 c runs ontoconvex portion 43 c throughhole 43 e ofholder 43 by its elasticity. The base ofguide 45 c is then latched at the end ofhole 43 e and stay, and so puncturingneedle 32 does not project fromblood sensor 20 again so that it is secure and does not make the patient feel fear. - As described above,
holder 43 ofcartridge 42 preferably has a function of an attaching guide for attachingblood sensor 20 to attachingpart 41 a of the blood test apparatus.FIG. 23 is a plan view that expands the main part of an example of the attaching part for attachingcartridge 42 withblood sensor 20 to attachingpart 41 a of the blood test apparatus.Convex portion 43 d formed inholder 43 functions as attaching guide.Convex portion 41 f is formed inside attachingpart 41 a of the blood test apparatus. Tip part 41 g ofconvex portion 41 f and tippart 43 g ofconvex portion 43 d preferably have a sharp angle. - When
cartridge 42 is attached,convex portion 43 d andconvex portion 41 f face each other, and, even if the relative position is shifted,cartridge 42 is attached while its angle is modified as shown byarrow 57. As a result, the contact parts arranged in the blood sensor ofcartridge 42 and the connectors of the blood test apparatus contact reliably. -
FIG. 24 is a cross-sectional view of attachingpart 41 a of the blood test apparatus to whichcartridge 42 is attached. As shown inFIG. 24 ,cartridge 42 is attached with the help of the attaching guide, so thatconvex portion 41 f andconvex portion 43 d are engaged, the angle ofcartridge 42 is modified to a predetermined angle, andcartridge 42 is fixed inside attachingpart 41 a. As a result,connector 47 contacts with the contact part ofblood sensor 20 reliably and transmit a signal ofblood sensor 20 to measuringcircuit 52 reliably. -
FIG. 25 is a cross-sectional view ofcartridge 42 and attachingpart 41 a into which thiscartridge 42 is inserted.FIG. 25A shows a state whereplunger 50 is pulled backward, and puncturingneedle 32 is incartridge 42. That is,FIG. 25A shows a state before puncturing.FIG. 25B shows a state whereplunger 50 projects forward, and puncturingneedle 32 breaks throughcover 23 ofsensor 20 and punctures the skin of the patient.FIG. 25C shows a state whereplunger 50 is pulled backward, and puncturingneedle 32 is accommodated incartridge 42. In this way, except for the state whereplunger 50 projects forward, puncturingneedle 32 is accommodated incartridge 42. - An example of the blood test apparatus to which
blood sensor 20 is attached will be described.FIG. 26 is a cross-sectional view ofblood test apparatus 40.Blood test apparatus 40 hashousing 41 formed with resin.Housing 41 is a frame of the apparatus and accommodates main members of the apparatus. - One side of
housing 41 is attachingpart 41 a.Blood sampling cartridge 42 is preferably inserted intoend 41 b of attachingpart 41 a. Positioningconcave portion 41 h provided on the attachingpart 41 a side and positioningconvex portion 43 h provided atholder 43 on theblood sampling cartridge 42 side are engaged, and therebyblood sampling cartridge 42 inserted to attachingpart 21 a is fixed to a predetermined position in attachingpart 41 a (position in a horizontal direction inFIG. 26 ). -
Blood sampling cartridge 42 has: cylinder-shapedholder 43;blood sensor 20 that is attached to oneend 43 a ofholder 43;lancet 45 that can slide insideholder 43 freely; and puncturingneedle 32 that is attached to theother end 45 b oflancet 45.Blood sensor 20 includes electrodes and connection terminals connected to the electrodes.Connector 47 contacts with the connection terminal. -
Grip part 45 f formed near oneend 45 a oflancet 45 which is one member ofblood sampling cartridge 42, is held by holdingpart 50 a provided at one end ofplunger 50 that slides inside attachingpart 41 a.Plunger 50 holdslancet 45, so that, when the skin is punctured with puncturingneedle 32, puncturingneedle 32 does not shake and enables high linearity of movement, so that it is possible to puncture the skin with puncturingneedle 32 stably. - On the other hand, the
other end 50 b ofplunger 50 is connected to oneend 51 a ofhandle 51 formed in the shape of a crank. Latchconvex portion 51 c is formed at theother end 51 b ofhandle 51.Handle 51 goes throughhole 41 c formed inhousing 41 and is latched by the joint of latchconvex portion 51 c and latchconcave portion 41 d. - As the drive mechanism of
plunger 50, for example, the method disclosed in Japanese Patent Application Laid-Open No. 2006-314718 can be adopted. According to this method, a puncturing needle can move straight backward and stay after puncturing, so that it is possible to alleviate the pain of the patient upon puncturing to a minimum, and, further, accomplish a mechanism for preventing the blood collection needle from puncturing the patient's skin several times and adjusting the depth of puncturing, in a simple manner. By providing such a prevention mechanism and an adjustment mechanism on the blood test apparatus, instead of providing on the blood sampling cartridge, it is possible to realize a smaller and lower-cost blood sampling cartridge. - An example of the mechanism for preventing a puncturing needle from puncturing the patient's skin several times, is disclosed in Japanese Patent Application Laid-Open No. 2006-314718. A pull string, one end of which is fixed, has the other end hooked on a lever for which rotation is partially limited and which is provided in the plunger. A forward force is given to the plunger by a contracting and restoring force of the pull string. The plunger passes the position where the forward force is no longer given then the plunger moves on by inertia. In this case, the pull string is extended again with the help of the lever as fulcrum, and the plunger is given a force towards the rear end by the restoring force of the pull string. In this way, by configuring an urging means that gives a force towards the front end and a force towards the rear end to the plunger, with one pull spring, manufacturing process of a puncturing tool is simplified and a puncturing needle is prevented from puncturing the patient's skin several times (see unexamined patent publication).
- As an example of the mechanism for adjusting the depth of puncturing, when the plunger moves in the direction of the axis, puncturing
depth adjusting knob 84 that limits the amount of move and that has a receiving part, is jointed rotatably (seeFIG. 34 ). The receiving part (not shown) of puncturingdepth adjusting knob 84 has a helical shape. By rotating adjustingknob 84 with respect to attachingpart 41 a ofhousing 41, it is possible to change the amount of move of the plunger in the direction of the axis. - Measuring
circuit 52 is accommodated inside theother end 41 e side ofhousing 41. Measuringcircuit 52 is connected to terminal 53 formed in attachingpart 41 a. Further, terminal 53 is connected toconnector 47.Terminal 53 is configured with two or more (usually, four or five) terminals 53 a to 53 d (or 53 e) and connected to matchingconnectors 47 a to 47 d (or 47 e). As described above,connectors 47 contact with matching connection terminals, respectively. The housing accommodatesbattery 54 that supplies power to measuringcircuit 52. - As described above,
blood test apparatus 40 hasblood sampling cartridge 42 that is integrated with built-inlancet 45 with puncturingneedle 32 attached and built-inblood sensor 20, andblood sampling cartridge 42 can be attached to and removed from attachingpart 41 a. Therefore, the whole ofblood sampling cartridge 42, including the puncturing needle and the blood sensor, can be changed in a simple manner. Further,blood sensor 20 and puncturingneedle 32 are changed together every test, so that there is no fear that puncturing needle is used several times and there is no threat of infection. - Puncturing
needle 32 ofblood sampling cartridge 42 is accommodated inholder 43 upon attachment, so that puncturingneedle 32 does not hurt the patient and is secure and does not make the patient feel fear. Further, puncturingneedle 32 accommodated inholder 43 does not allow direct touch, and so is sanitary. -
FIG. 27 shows an example of the flow of the test usingblood test apparatus 40. Instep 111,blood sampling cartridge 42 is inserted to attachingpart 41 a and attached toblood test apparatus 40. By this insertion,holder 43 is pressed into attachingpart 41 a and latched, and positioningconcave portion 41 h and positioningconvex portion 43 h are jointed to determine the position. Further,grip part 45 f oflancet 45 is held by holdingpart 50 a ofplunger 50. - In
step 112, the connection terminals ofblood sensor 20 are specified. For example, in the case ofblood sensor 20 a, resistance values between the contact parts in pairs (between 28 c to 31 c and 28 d to 31 d) are measured, andreference terminal 29 f is specified. Based on specifiedreference terminal 29 f,connection terminals 28 a to 31 a are specified. As a result,electrodes 28 to 30 of the electrode system are also specified. - In
step 113, the patient's skin is pressed withblood sensor 20 ofblood sampling cartridge 42 andblood sensor 20 is placed in close contact with the patient's skin. Instep 114, a locking mechanism ofplunger 50, formed by latchconvex portion 51 c provided athandle 51 and latchconcave portion 41 d provided athousing 41, is disengaged. By this means, puncturingneedle 32 attached tolancet 45 projects toward the skin byplunger 50 urged by the spring. - In
step 115, after the patient's skin is punctured with puncturingneedle 32, puncturingneedle 32 is moved backward and accommodated insideblood sampling cartridge 42. Instep 116, blood flows out and is sampled. The blood flowing out is brought toblood sensor 20 and led to detectingsection 27 placed insidesupply channel 25. Afterelectrode 29 as a detecting electrode determines that blood of the amount necessary for measurement is led to the detecting section, sampling blood is finished. In this way, blood is not over-sampled, so that it is possible to alleviate the load on the patient significantly. Whenblood 13 is not detected at detectingsection 27 after a predetermined time has passed or when the amount ofblood 13 is not adequate, a warning means may be activated for warning, and the measure may be displayed on a display section. - In
step 117, the glucose in the sampled blood is measured. After the glucose in the blood and a glucose oxidation-reduction enzyme are reacted for a certain period, a voltage is applied betweenelectrode 28 as a working electrode andelectrode 30 as a counter electrode. The mediator in a reduction condition, produced onelectrode 28 by enzyme reaction, is oxidized, and its oxidation current is measured. The reaction time of a glucose and an oxidation-reduction enzyme is normally 10 seconds or less, the voltage applies instep 117 is normally 0.2 to 0.5V, and the application time is normally 5 seconds or less. This application time is measured by timer 79 (described later). - In
step 118, the hematocrit (Hct) level is measured. When a voltage is applied betweenelectrode 31 as a working electrode andelectrode 30 as a counter electrode, a current that depends on the Hct level is measured. The Hct level is measured based on the detected current. The measured Hct level is utilized to correct the result of measuring the glucose. The relationship between the current and the Hct level may be calculated in advance as a calibration curve, and the measured current may be applied as it is. - Generally, the voltage applied in
step 118 is approximately 2 to 3 V, and the application time is approximately 5 seconds or less. A mediator is not provided atelectrode 31, which is a working electrode. There is a certain interval betweenelectrode 31 andelectrode 30, and only blood exists in this interval. Therefore, instep 118, an oxidation current that depends on the Hct level can be measured without being influenced byreagent 10. - Then, in
step 119, the measurement result of the blood components is corrected. That is, using the Hct level measured instep 118, the glucose content calculated instep 117 is corrected. This correction is performed based on the calibration curve (including a calibration table) created in advance. The corrected glucose content is displayed ondisplay section 75 ofblood test apparatus 40. - After going through
steps blood sampling cartridge 42 is collected or discarded every measurement. -
FIG. 28 shows the measurement principle ofblood test apparatus 40 that measures the blood sugar level of blood.Glucose 101 in blood reacts with glucose dehydrogenase (GDH) 103 specifically andproduct 102 is given, andpotassium ferricyanide 104 is reduced andpotassium ferrocyanide 105 is generated. The amount of generatedpotassium ferrocyanide 105 is proportional to the concentration ofglucose 101.Potassium herrocyanide 105 is oxidized on electrode 28 (seeFIG. 4 and the like) as a working electrode, and, at this time, oxidation response current 106 flowingelectrode 30 as a counter electrode is proportional to the concentration ofglucose 101. Therefore, the blood sugar level can be measured based on this oxidation response current 106. -
FIG. 29 shows an output example of the measurement result ofblood test apparatus 20. The horizontal axis shows the concentration (mg/dL) ofglucose 101, and the vertical axis shows response current 106 (μA). In this way, oxidation response current 106 is proportional to the concentration ofglucose 101. -
FIG. 30 is a block diagram ofblood test apparatus 52. The same components will be assigned the same reference numerals for ease of explanation.Blood test apparatus 52 inFIG. 30 hasblood sensor 20 b.Connection terminals 28 a to 31 a andreference terminal 29 h ofblood sensor 20 b are connected to terminals 53 a to 53 e via connectors. Terminals 53 a to 53 e are connected to switchcircuit 71, and the output ofswitch circuit 71 is connected to the input of current/voltage converter 72. The output of current/voltage converter 72 is connected to the input of calculatingsection 74 via analogue/digital converter (hereinafter A/D converter) 73. The output of calculatingsection 74 is connected to display section (for example, a liquid crystal display device) and also connected to the input of transmittingsection 77. Further,reference voltage supply 78 is connected to switchcircuit 71.Reference voltage supply 78 may be a ground potential. The output of controllingsection 76 is connected to a control terminal ofswitch circuit 71, calculatingsection 74, transmittingsection 77 andtimer 79. A warning means (not shown) may be connected to the output of controllingsection 76. - When a test is conducted using
blood test apparatus 52 adoptingblood sensor 20 b, it is necessary to specify which of terminals 53 a to 53e connection terminals 28 a to 31 a are connected to (via connectors), before measuring the blood components. Therefore, by the command of controllingsection 76, out of terminals 33 a to 33 e, terminals having conductivity with the neighboring terminals are specified. If a terminal having conductivity is specified, the electrode connected to the terminal is determined to beconnection terminal 29 a. Using the terminal connected toconnection terminal 29 a as a reference, terminals connected toconnection terminals connection terminals 28 a to 31 a are determined, the blood components are measured. - Next,
switch circuit 71 is switched, andelectrode 28 as a working electrode for measuring the amount of blood components is connected to current/voltage converter 72 viaterminal 53. On the other hand,electrode 29 which serves as a detecting electrode for detecting the inflow of blood is connected to referencevoltage supply 78 viaterminal 53. A certain voltage is applied betweenelectrode 28 andelectrode 29. When the blood is led to the detecting section in this state, a current flows betweenelectrode 28 andelectrode 29. This current is converted to a voltage by current/voltage converter 72, and the voltage value is converted to a digital value by A/D converter 73. The digital value is then outputted to calculatingsection 74. Calculatingsection 74 detects the inflow of blood based on the digital value. - Next, the amount of blood components (glucose) is measured. The glucose content is measured by, first, switching
switch circuit 71 by the command of controllingsection 76 and connectingelectrode 28, which is a working electrode for measuring the glucose content, to current/voltage converter 72 viaterminal 53. On the other hand,electrode 30, which is a counter electrode for measuring the glucose content, is connected to referencevoltage supply 78 viaterminal 53. - While the glucose in the blood and the oxidation-reduction enzyme are reacted for a certain period, current/
voltage converter 72 andreference voltage supply 78 may be turned off. If a certain voltage (0.2 to 0.5 V) is applied betweenelectrode section 76 after the glucose in the blood and the oxidation-reduction enzyme are reacted for a certain period (10 seconds or less), a current flows betweenelectrode 28 andelectrode 30. This current is converted to a voltage by current/voltage converter 72, and the voltage value is converted to a digital value by A/D converter 73 and outputted to calculatingsection 74. Calculatingsection 74 converts the digital value to a glucose content. - After the glucose content is measured, the Hct level is measured. First, by the command of controlling
section 76,switch circuit 71 is switched to connectelectrode 31, which is a working electrode for measuring the Hct level, to current/voltage converter 72 viaterminal 53. On the other hand,electrode 28, which is a counter electrode for measuring the Hct level, is connected to referencevoltage supply 78. - Then, by the command of controlling
section 76, a certain voltage (2 to 3 V) is applied betweenelectrode 31 andelectrode 28 from current/voltage converter 72 andreference voltage supply 78. The current flowing betweenelectrode 31 andelectrode 28 is converted to a voltage by current/voltage converter 72, and the voltage value is converted to a digital value by A/D converter 73 and outputted to calculatingsection 74. Calculatingsection 74 measures the Hct level based on the digital value. - Using the measured Hct level and the glucose content, and, with reference to the calibration curve or the calibration table prepared in advance, the glucose content is corrected with the Hct level. The result after correction may be displayed on
display section 75 or transmitted to an injection apparatus that injects a curative drug (for example, insulin) from transmittingsection 77. The result after correction may be transmitted by radio, but is preferably transmitted using optical communication which does not interfere with medical equipment. - If the injection apparatus for injecting curative drug can set a dose of the curative drug automatically based on the result after correction (measured data) transmitted from transmitting
section 77, the patient does not have to set a dose of the curative drug, which eliminates the inconvenience of setting a dose. Further, the amount of insulin can be set for the injection apparatus without involving an artificial means, so that it is possible to prevent setting errors. - The blood test apparatus of the present invention may have a negative pressure means. By the negative pressure means, a negative pressure is preferably applied near the part of the skin punctured with puncturing
needle 32. Therefore,blood test apparatus 40 having the negative pressure means preferably has a member for surrounding the neighborhood of the punctured part of the skin, and may apply a negative pressure to the space surrounded by the member. -
FIG. 31 is a block diagram ofblood test apparatus 52 a having a negative pressure means.Blood test apparatus 52 a is different fromblood test apparatus 52 shown inFIG. 30 in thatblood test apparatus 52 has a negative pressure means, and so the difference will be mainly described. The same components asblood test apparatus 52 will be assigned the same reference numerals for ease of explanation. - In
FIG. 31 ,guard part 131 is provided, which extends from 41 b of attachingpart 41 a. Controllingsection 76 a is connected to negative pressure means 82 (for example, a vacuum generator), and the output of negative pressure means 82 is connected inside ofguard part 131 vianegative pressure path 83. Therefore, negative pressure can be supplied inside ofguard part 131 by negative pressure means 82. - Negative pressure means 82 may be started after
step 111 in whichblood sensor 20 a is brought into close contact with the measurement part, and stay afterstep 116 in which blood is sampled. Upon sampling blood, by supplying a negative pressure between the skin punctured with the puncturing needle andblood sensor 20 b, the skin is put under a state of tension so as to enable fast and reliable blood sampling. -
FIG. 32 is a cross-sectional view ofblood test apparatus 52 a. InFIG. 32 ,guard part 131 is provided which extends fromend 41 b of attachingpart 41 a. The output of negative pressure means 82 (for example, a vacuum generator) connected to controllingsection 76 a is connected insideguard part 131 vianegative pressure path 83. Therefore, negative pressure means 82 can supply a negative pressure insideguard part 131. -
FIG. 33 is a cross-sectional view that expands the main part nearguard part 131 ofblood test apparatus 52 a. InFIG. 33 , as a result of the operation of negative pressure means 82,inner part 131 a ofguard part 131 is sucked in as shown byarrow 83 a, andskin 7 is brought in close contact withsensor 20 ofguard part 131 and put under a state of tension. At this time,inner part 42 a ofblood sampling cartridge 42 is also sucked in. Before puncturing with puncturingneedle 32,skin 7 is preferably lifted by sucking in the inner part of storingpart 24 in a direction ofarrow 83 b by supplying a negative pressure fromair hole 26. By this means,skin 7 is put under a state of tension to make puncturing easier. After puncturing with puncturingneedle 32, the inner part of storingpart 24 is sucked in from puncturinghole 36 in addition to fromair hole 26 as shown byarrow 83 c, and a negative pressure is further supplied to further liftskin 7 and helpblood 13 to be sampled. - In this way,
air hole 26 andsupply channel 25 are also used as negative pressure supply channels, so that it is possible to supply a negative pressure to the inner part of storingpart 24 without providing a negative pressure supply channel separately. Further, after puncturing, puncturinghole 36 can be also used as a negative pressure supply channel. -
FIG. 34 shows a state where the patient tries to examine blood usingblood test apparatus 40. The patient is trying to sample the blood from the index finger of the patient's left hand and measure blood components (for example, the blood sugar level). Inblood test apparatus 40, attachingpart 41 a is provided on one side ofhousing 41.Blood sampling cartridge 42 is inserted and fixed at attachingpart 41 a, andblood sensor 20 is attached to one end ofblood sampling cartridge 42. Further,display section 75 is provided on the other side ofhousing 41. As a mechanism for driving a plunger, for example, the method disclosed in Japanese Patent Application Laid-Open No. 2006-314718 can be adopted. By this means, it is possible to realize a mechanism for preventing sticking twice and a mechanism for adjusting the depth of puncturing. Further,blood test apparatus 40 may have a mechanism for adjusting the depth of puncturing, and, as an example of this mechanism,FIG. 34 shows puncturingdepth adjusting control 84. - The blood test apparatus of the present invention can be used to measure glucose, and also is suitable for measuring blood components such as the lactate level and cholesterol.
- In the blood test apparatus of the present invention, a blood sampling cartridge including a puncturing needle and a blood sensor can be attached and removed in a simple manner, and is applicable to medical equipment, and the like.
- The present application is based on Japanese Patent Application No. 2006-022039, filed on Jan. 31, 2006, the entire content of which is expressly incorporated by reference herein.
Claims (10)
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US13/237,157 US8444576B2 (en) | 2006-01-31 | 2011-09-20 | Blood test apparatus having blood sensor |
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JP2006022039 | 2006-01-31 | ||
PCT/JP2007/051508 WO2007088855A1 (en) | 2006-01-31 | 2007-01-30 | Blood sensor and blood test apparatus having the same |
US16261208A | 2008-07-30 | 2008-07-30 | |
US13/237,157 US8444576B2 (en) | 2006-01-31 | 2011-09-20 | Blood test apparatus having blood sensor |
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US12/162,612 Division US8052619B2 (en) | 2006-01-31 | 2007-01-30 | Blood sensor and blood test apparatus having the same |
US16261208A Division | 2006-01-31 | 2008-07-30 |
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US13/237,157 Active US8444576B2 (en) | 2006-01-31 | 2011-09-20 | Blood test apparatus having blood sensor |
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EP (1) | EP1980203B8 (en) |
JP (1) | JP4944802B2 (en) |
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KR100981222B1 (en) | 2010-09-10 |
US8444576B2 (en) | 2013-05-21 |
JPWO2007088855A1 (en) | 2009-06-25 |
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JP4944802B2 (en) | 2012-06-06 |
WO2007088855A1 (en) | 2007-08-09 |
CN101374458B (en) | 2012-04-18 |
EP1980203A1 (en) | 2008-10-15 |
EP1980203B1 (en) | 2014-03-12 |
EP1980203A4 (en) | 2012-03-14 |
CA2640969A1 (en) | 2007-08-09 |
CN101374458A (en) | 2009-02-25 |
KR20080073789A (en) | 2008-08-11 |
US20090043227A1 (en) | 2009-02-12 |
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US8052619B2 (en) | 2011-11-08 |
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